feat(characters): enable isolated pre-release role switching

docs/backend/FRONTEND_MULTI_CHARACTER_API.md

@@ -16,7 +16,7 @@
 
 | 类型 | Elio 示例 | 用途 |
 | --- | --- | --- |
-| `id` | `character_elio` | 数据库关联、API 请求和缓存隔离 |
+| `id` | `elio` | 数据库关联、API 请求和缓存隔离 |
 | `slug` | `elio` | 前端 URL 和外部入口 |
 
 后端业务接口必须使用 `id`，不能使用可能变化的展示名称。
@@ -37,9 +37,9 @@
 
 | `id` | `slug` | `displayName` | 头像 | 页面封面 | 私密空间 Banner |
 | --- | --- | --- | --- | --- | --- |
-| `character_elio` | `elio` | Elio Silvestri | `/images/avatar/elio.png` | `/images/cover/elio.png` | `/images/private-room/banner/elio.png` |
-| `character_maya` | `maya` | Maya Tan | `/images/avatar/maya.png` | `/images/cover/maya.png` | `/images/private-room/banner/maya.png` |
-| `character_nayeli` | `nayeli` | Nayeli Cervantes | `/images/avatar/nayeli.png` | `/images/cover/nayeli.png` | `/images/private-room/banner/nayeli.png` |
+| `elio` | `elio` | Elio Silvestri | `/images/avatar/elio.png` | `/images/cover/elio.png` | `/images/private-room/banner/elio.png` |
+| `maya-tan` | `maya` | Maya Tan | `/images/avatar/maya.png` | `/images/cover/maya.png` | `/images/private-room/banner/maya.png` |
+| `nayeli-cervantes` | `nayeli` | Nayeli Cervantes | `/images/avatar/nayeli.png` | `/images/cover/nayeli.png` | `/images/private-room/banner/nayeli.png` |
 
 当前开发环境开放表中的全部角色。Catalog 同时保存短名称、页面资源、空聊天问候语、排序及 Chat、Private Room、Tip 能力。后端配置中的角色 ID 必须与前端目录一致。
 
@@ -56,7 +56,7 @@ POST /api/chat/unlock-private
 POST /api/chat/unlock-history
 ```
 
-`characterId` 使用前端本地角色目录中的 `id`，例如 `character_elio`，不能传 slug 或显示名称。
+`characterId` 使用前端本地角色目录中的 `id`，例如 `elio`，不能传 slug 或显示名称。
 
 后端必须使用以下维度定位聊天数据：
 
@@ -79,7 +79,7 @@ Authorization: Bearer <TOKEN>
 
 ```json
 {
-  "characterId": "character_elio",
+  "characterId": "elio",
   "message": "Hello Elio",
   "image": "",
   "imageId": "",
@@ -105,7 +105,7 @@ Authorization: Bearer <TOKEN>
 ### 3.3 获取聊天历史
 
 ```http
-GET /api/chat/history?characterId=character_elio&limit=50&offset=0
+GET /api/chat/history?characterId=elio&limit=50&offset=0
 Authorization: Bearer <TOKEN>
 ```
 
@@ -131,7 +131,7 @@ Authorization: Bearer <TOKEN>
 
 ```json
 {
-  "characterId": "character_elio",
+  "characterId": "elio",
   "messageId": "message-id",
   "lockType": "voice_message",
   "clientLockId": "client-generated-id"
@@ -164,7 +164,7 @@ Authorization: Bearer <TOKEN>
 
 ```json
 {
-  "characterId": "character_elio"
+  "characterId": "elio"
 }
 ```
 
@@ -190,7 +190,7 @@ Authorization: Bearer <TOKEN>
   "data": {
     "items": [
       {
-        "characterId": "character_elio",
+        "characterId": "elio",
         "message": {
           "id": "message-id",
           "role": "assistant",
@@ -220,7 +220,7 @@ Authorization: Bearer <TOKEN>
 标准请求改为：
 
 ```http
-GET /api/private-room/albums?characterId=character_elio&limit=20
+GET /api/private-room/albums?characterId=elio&limit=20
 Authorization: Bearer <TOKEN>
 ```
 
@@ -266,7 +266,7 @@ POST /api/payment/create-order
   "planId": "tip_coffee_medium",
   "payChannel": "stripe",
   "autoRenew": false,
-  "recipientCharacterId": "character_elio"
+  "recipientCharacterId": "elio"
 }
 ```
 
@@ -326,9 +326,9 @@ Tip 订单和最终支付记录需要保存 `recipient_character_id`，用于归
 
 上线新接口前执行：
 
-1. 创建 Elio 角色，固定 `id=character_elio`、`slug=elio`。
+1. 创建 Elio 角色，固定 `id=elio`、`slug=elio`。
 2. 为相关业务表增加可空 `character_id`。
-3. 将现有消息、锁记录、相册和 Tip 记录全部回填为 `character_elio`。
+3. 将现有消息、锁记录、相册和 Tip 记录全部回填为 `elio`。
 4. 检查不存在空角色或无法关联的数据。
 5. 创建联合索引和外键。
 6. 将必要业务表的 `character_id` 调整为非空。
@@ -340,7 +340,7 @@ Tip 订单和最终支付记录需要保存 `recipient_character_id`，用于归
 ### 第一阶段：后端兼容
 
 - 上线角色 ID 配置和新字段。
-- Chat 请求缺少 `characterId` 时暂时默认 `character_elio`。
+- Chat 请求缺少 `characterId` 时暂时默认 `elio`。
 - Private Room 缺少角色时暂时默认 Elio。
 - Tip 旧客户端缺少 recipient 时，旧 Tip 订单暂时默认 Elio。
 - 记录缺少角色参数的调用次数和客户端版本。

src/app/_components/__tests__/character-switcher.test.tsx

@@ -0,0 +1,34 @@
+import { renderToStaticMarkup } from "react-dom/server";
+import { describe, expect, it } from "vitest";
+
+import { CHARACTERS, getCharacterBySlug } from "@/data/constants/character";
+import { CharacterCatalogProvider } from "@/providers/character-catalog-provider";
+import { CharacterProvider } from "@/providers/character-provider";
+
+import { CharacterSwitcher } from "../character-switcher";
+
+describe("CharacterSwitcher", () => {
+  it("links every chat character and marks the active account conversation", () => {
+    const maya = getCharacterBySlug("maya");
+    expect(maya).not.toBeNull();
+
+    const html = renderToStaticMarkup(
+      <CharacterCatalogProvider characters={CHARACTERS}>
+        <CharacterProvider character={maya!}>
+          <CharacterSwitcher />
+        </CharacterProvider>
+      </CharacterCatalogProvider>,
+    );
+
+    expect(html).toContain('aria-label="Choose character"');
+    expect(html).toContain('href="/characters/elio/splash"');
+    expect(html).toContain('href="/characters/maya/splash"');
+    expect(html).toContain('href="/characters/nayeli/splash"');
+    expect(html).toContain('data-character-id="elio"');
+    expect(html).toContain('data-character-id="maya-tan"');
+    expect(html).toContain('data-character-id="nayeli-cervantes"');
+    expect(html).toMatch(
+      /<a(?=[^>]*data-character-id="maya-tan")(?=[^>]*aria-current="page")[^>]*>/,
+    );
+  });
+});

src/app/_components/character-switcher.tsx

@@ -0,0 +1,66 @@
+"use client";
+
+import Link from "next/link";
+
+import { getCharacterRoutes } from "@/router/routes";
+import { useActiveCharacter } from "@/providers/character-provider";
+import { useCharacterCatalog } from "@/providers/character-catalog-provider";
+
+import { CharacterAvatar } from "./character-avatar";
+
+export interface CharacterSwitcherProps {
+  destination?: "splash" | "chat";
+}
+
+export function CharacterSwitcher({
+  destination = "splash",
+}: CharacterSwitcherProps) {
+  const activeCharacter = useActiveCharacter();
+  const catalog = useCharacterCatalog();
+  const chatCharacters = catalog.characters.filter(
+    (character) => character.capabilities.chat,
+  );
+
+  return (
+    <nav
+      aria-label="Choose character"
+      className="grid w-full grid-cols-3 gap-1 rounded-lg border border-white/15 bg-black/35 p-1 shadow-[0_8px_24px_rgba(0,0,0,0.18)] backdrop-blur-md"
+    >
+      {chatCharacters.map((character) => {
+        const isActive = character.id === activeCharacter.id;
+        const routes = getCharacterRoutes(character.slug);
+        return (
+          <Link
+            key={character.id}
+            href={routes[destination]}
+            aria-current={isActive ? "page" : undefined}
+            aria-label={`Chat with ${character.displayName}`}
+            title={character.displayName}
+            data-character-id={character.id}
+            data-analytics-key="character.switch"
+            data-analytics-label={`Switch to ${character.displayName}`}
+            className={[
+              "flex min-w-0 items-center justify-center gap-1.5 rounded-md px-1.5 py-1.5 text-[11px] font-semibold text-white transition-colors duration-150 focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-white",
+              isActive
+                ? "bg-white/20 shadow-[inset_0_0_0_1px_rgba(255,255,255,0.18)]"
+                : "bg-transparent hover:bg-white/10",
+            ].join(" ")}
+          >
+            <CharacterAvatar
+              src={character.assets.avatar}
+              alt=""
+              size={28}
+              imageSize={56}
+              className={
+                isActive
+                  ? "ring-2 ring-white ring-offset-1 ring-offset-transparent"
+                  : "opacity-85"
+              }
+            />
+            <span className="min-w-0 truncate">{character.shortName}</span>
+          </Link>
+        );
+      })}
+    </nav>
+  );
+}

src/app/_components/core/__tests__/tailwind-components.test.tsx

@@ -93,6 +93,15 @@ describe("core Tailwind components", () => {
         onPrivateRoomClick={() => undefined}
       />,
     );
+    const disabledPrivateRoomHtml = renderToStaticMarkup(
+      <AppBottomNav
+        activeItem="chat"
+        privateRoomLabel="Maya Private room"
+        privateRoomEnabled={false}
+        onChatClick={() => undefined}
+        onPrivateRoomClick={() => undefined}
+      />,
+    );
 
     expect(chatHtml).toContain('aria-label="Primary navigation"');
     expect(chatHtml).toMatch(/class="[^"]*dark[^"]*"/);
@@ -107,5 +116,8 @@ describe("core Tailwind components", () => {
     expect(privateRoomHtml).toContain(
       'data-analytics-key="navigation.private_room"',
     );
+    expect(disabledPrivateRoomHtml).toMatch(
+      /<button[^>]*aria-disabled="true"[^>]*disabled=""[^>]*>/,
+    );
   });
 });

src/app/_components/core/app-bottom-nav.module.css

@@ -80,6 +80,20 @@
   outline-offset: 3px;
 }
 
+.disabled {
+  cursor: not-allowed;
+  opacity: 0.42;
+}
+
+.disabled:hover {
+  background: transparent;
+  color: var(--nav-button-color);
+}
+
+.disabled:active {
+  transform: none;
+}
+
 .active {
   color: var(--nav-active-color);
 }

src/app/_components/core/app-bottom-nav.tsx

@@ -11,6 +11,7 @@ export interface AppBottomNavProps {
   activeItem?: AppBottomNavItem | null;
   variant?: AppBottomNavVariant;
   privateRoomLabel: string;
+  privateRoomEnabled?: boolean;
   onChatClick: () => void;
   onPrivateRoomClick: () => void;
 }
@@ -19,6 +20,7 @@ export function AppBottomNav({
   activeItem = null,
   variant = "warm",
   privateRoomLabel,
+  privateRoomEnabled = true,
   onChatClick,
   onPrivateRoomClick,
 }: AppBottomNavProps) {
@@ -39,8 +41,13 @@ export function AppBottomNav({
         type="button"
         data-analytics-key="navigation.private_room"
         data-analytics-label="Private room navigation"
-        className={getButtonClass(activeItem === "privateRoom")}
+        className={getButtonClass(
+          activeItem === "privateRoom",
+          !privateRoomEnabled,
+        )}
         aria-current={activeItem === "privateRoom" ? "page" : undefined}
+        aria-disabled={!privateRoomEnabled}
+        disabled={!privateRoomEnabled}
         onClick={onPrivateRoomClick}
       >
         <Camera size={20} aria-hidden="true" />
@@ -54,6 +61,12 @@ function getRootClass(variant: AppBottomNavVariant): string {
   return [styles.root, styles[variant]].filter(Boolean).join(" ");
 }
 
-function getButtonClass(active: boolean): string {
-  return [styles.button, active ? styles.active : ""].filter(Boolean).join(" ");
+function getButtonClass(active: boolean, disabled = false): string {
+  return [
+    styles.button,
+    active ? styles.active : "",
+    disabled ? styles.disabled : "",
+  ]
+    .filter(Boolean)
+    .join(" ");
 }

src/app/splash/splash-screen.tsx

@@ -2,6 +2,7 @@
 
 import { useEffect } from "react";
 
+import { CharacterSwitcher } from "@/app/_components/character-switcher";
 import { AppBottomNav, MobileShell } from "@/app/_components/core";
 import { useAppNavigator } from "@/router/use-app-navigator";
 import {
@@ -57,6 +58,9 @@ export function SplashScreen() {
         <div className={styles.gradientOverlay} aria-hidden="true" />
         <div className={styles.content}>
           <SplashLogo />
+          <div className="mt-3 w-full max-w-120">
+            <CharacterSwitcher />
+          </div>
           <div className={styles.spacer} />
           <SplashLatestMessage
             message={latestMessage.message}
@@ -78,6 +82,7 @@ export function SplashScreen() {
         <AppBottomNav
           activeItem="chat"
           privateRoomLabel={character.copy.privateRoomTitle}
+          privateRoomEnabled={character.capabilities.privateRoom}
           onChatClick={handleOpenSplash}
           onPrivateRoomClick={handleOpenPrivateRoom}
         />

src/data/constants/__tests__/character.test.ts

@@ -40,7 +40,7 @@ describe("local character catalog", () => {
   });
 
   it("resolves characters by id and normalized slug", () => {
-    expect(getCharacterById("character_maya")?.displayName).toBe("Maya Tan");
+    expect(getCharacterById("maya-tan")?.displayName).toBe("Maya Tan");
     expect(getCharacterBySlug(" NAYELI ")?.displayName).toBe(
       "Nayeli Cervantes",
     );
@@ -50,11 +50,11 @@ describe("local character catalog", () => {
 
   it("describes route capabilities and character-specific chat copy", () => {
     for (const character of CHARACTERS) {
-      expect(character.capabilities).toEqual({
-        chat: true,
-        privateRoom: true,
-        tip: true,
-      });
+      expect(character.capabilities.chat).toBe(true);
+      expect(character.capabilities.tip).toBe(true);
+      expect(character.capabilities.privateRoom).toBe(
+        character.id === "elio",
+      );
       expect(character.tagline.length).toBeGreaterThan(0);
       expect(character.emptyChatGreeting.length).toBeGreaterThan(0);
       expect(character.assets.chatBackground).toBe(

src/data/constants/character.ts

@@ -45,7 +45,7 @@ function defineCharacter(profile: CharacterProfile): CharacterProfile {
 
 const CHARACTER_PROFILES: readonly CharacterProfile[] = Object.freeze([
   defineCharacter({
-    id: "character_elio",
+    id: "elio",
     slug: "elio",
     displayName: "Elio Silvestri",
     shortName: "Elio",
@@ -75,7 +75,7 @@ const CHARACTER_PROFILES: readonly CharacterProfile[] = Object.freeze([
     },
   }),
   defineCharacter({
-    id: "character_maya",
+    id: "maya-tan",
     slug: "maya",
     displayName: "Maya Tan",
     shortName: "Maya",
@@ -86,7 +86,7 @@ const CHARACTER_PROFILES: readonly CharacterProfile[] = Object.freeze([
       "How was your day?",
     capabilities: {
       chat: true,
-      privateRoom: true,
+      privateRoom: false,
       tip: true,
     },
     assets: {
@@ -104,7 +104,7 @@ const CHARACTER_PROFILES: readonly CharacterProfile[] = Object.freeze([
     },
   }),
   defineCharacter({
-    id: "character_nayeli",
+    id: "nayeli-cervantes",
     slug: "nayeli",
     displayName: "Nayeli Cervantes",
     shortName: "Nayeli",
@@ -115,7 +115,7 @@ const CHARACTER_PROFILES: readonly CharacterProfile[] = Object.freeze([
       "Tell me how your day went.",
     capabilities: {
       chat: true,
-      privateRoom: true,
+      privateRoom: false,
       tip: true,
     },
     assets: {

src/data/mock/chat/requests/send-image-message.json

@@ -1,5 +1,5 @@
 {
-  "characterId": "character_elio",
+  "characterId": "elio",
   "message": "Look at this sunset.",
   "image": "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD...",
   "imageId": "img_mock_001",

src/data/mock/chat/requests/send-text-message.json

@@ -1,5 +1,5 @@
 {
-  "characterId": "character_elio",
+  "characterId": "elio",
   "message": "I missed you today.",
   "image": "",
   "imageId": "",

src/data/mock/chat/requests/unlock-private-message.json

@@ -1,4 +1,4 @@
 {
-  "characterId": "character_elio",
+  "characterId": "elio",
   "messageId": "msg_private_locked_001"
 }

src/data/repositories/__tests__/chat_media_cache_coordinator.test.ts

@@ -31,7 +31,7 @@ describe("ChatMediaCacheCoordinator identity isolation", () => {
     expect(result).toEqual(Result.ok(null));
     expect(getMedia).toHaveBeenCalledTimes(1);
     expect(getMedia).toHaveBeenCalledWith(
-      "user:account-a::character:character_elio:message-1:image",
+      "user:account-a::character:elio:message-1:image",
     );
   });
 
@@ -46,19 +46,19 @@ describe("ChatMediaCacheCoordinator identity isolation", () => {
     );
 
     await coordinator.getCachedMedia({
-      characterId: "character_elio",
+      characterId: "elio",
       messageId: "shared-message-id",
       kind: "image",
     });
     await coordinator.getCachedMedia({
-      characterId: "character_aria",
+      characterId: "maya-tan",
       messageId: "shared-message-id",
       kind: "image",
     });
 
     expect(getMedia.mock.calls).toEqual([
-      ["user:account-a::character:character_elio:shared-message-id:image"],
-      ["user:account-a::character:character_aria:shared-message-id:image"],
+      ["user:account-a::character:elio:shared-message-id:image"],
+      ["user:account-a::character:maya-tan:shared-message-id:image"],
     ]);
   });
 
@@ -112,7 +112,7 @@ describe("ChatMediaCacheCoordinator identity isolation", () => {
         kind: "image",
         remoteUrl: "https://media.example/expired.jpg",
       },
-      "user:account-a::character:character_elio",
+      "user:account-a::character:elio",
     );
 
     expect(Result.isErr(result)).toBe(true);

src/data/services/api/__tests__/multi_character_api.test.ts

@@ -15,7 +15,7 @@ vi.mock("../http_client", () => ({
 import { ChatApi } from "../chat_api";
 import { PrivateRoomApi } from "../private_room_api";
 
-const CHARACTER_ID = "character_elio";
+const CHARACTER_ID = "elio";
 
 describe("multi-character API contract", () => {
   beforeEach(() => {

src/lib/chat/__tests__/splash_latest_message.test.ts

@@ -32,7 +32,7 @@ describe("fetchSplashLatestMessagePreview", () => {
     const result = await fetchSplashLatestMessagePreview();
 
     expect(getHistoryMock).toHaveBeenCalledWith(
-      "character_elio",
+      "elio",
       1,
       0,
     );

src/providers/character-provider.tsx

@@ -24,13 +24,17 @@ export function CharacterProvider({
 }
 
 export function useActiveCharacter(): CharacterProfile {
-  const character = useContext(CharacterContext);
+  const character = useOptionalActiveCharacter();
   if (!character) {
     throw new Error("useActiveCharacter must be used within CharacterProvider.");
   }
   return character;
 }
 
+export function useOptionalActiveCharacter(): CharacterProfile | null {
+  return useContext(CharacterContext);
+}
+
 export function useActiveCharacterRoutes(): CharacterRoutes {
   return getCharacterRoutes(useActiveCharacter().slug);
 }

src/router/use-app-navigator.ts

@@ -16,12 +16,11 @@ import {
 } from "@/lib/analytics";
 import { useAuthSelector } from "@/stores/auth/auth-context";
 import { useUserSelector } from "@/stores/user/user-context";
-import {
-  useActiveCharacter,
-  useActiveCharacterRoutes,
-} from "@/providers/character-provider";
+import { DEFAULT_CHARACTER } from "@/data/constants/character";
+import { useOptionalActiveCharacter } from "@/providers/character-provider";
 
 import {
+  getCharacterRoutes,
   ROUTE_BUILDERS,
   type Route,
 } from "./routes";
@@ -60,8 +59,8 @@ export interface AppNavigator {
 
 export function useAppNavigator(): AppNavigator {
   const router = useRouter();
-  const character = useActiveCharacter();
-  const characterRoutes = useActiveCharacterRoutes();
+  const character = useOptionalActiveCharacter() ?? DEFAULT_CHARACTER;
+  const characterRoutes = getCharacterRoutes(character.slug);
   const loginStatus = useAuthSelector((state) => state.context.loginStatus);
   const countryCode = useUserSelector(
     (state) => state.context.currentUser?.countryCode,