refactor(data): consolidate data layer under services namespace

- Move src/data/{api,dto,schemas} directories to src/data/services/*
- Update all relative imports across the codebase to reference new paths
- Use CSS color tokens for splash button gradient in splash-button.module.css
- Add responsive sizes attribute to splash background image
- Add JSDoc documentation to splash-background component referencing original Dart implementation

src/app/splash/components/splash-background.tsx

@@ -1,4 +1,17 @@
 "use client";
+/**
+ * Splash 背景图片
+ *
+ * 原始 Dart: lib/ui/splash/widgets/splash_background.dart
+ *   `SizedBox.expand(child: Assets.images.picBgHome.image(fit: BoxFit.cover))`
+ * 资源: /public/images/splash/pic-bg-home.png (kebab-case 重命名后)
+ *       原名: pic_bg_home.png (snake_case)
+ *
+ * sizes 属性说明：
+ *   图片在 MobileShell 内（max-width: 500px）。
+ *   - 视口 ≤ 500px：MobileShell = 100vw，图片 = 100vw
+ *   - 视口 > 500px：MobileShell = 500px，图片 = 500px
+ */
 import Image from "next/image";
 import styles from "./splash-background.module.css";
 
@@ -10,7 +23,7 @@ export function SplashBackground() {
         alt=""
         fill
         priority
-        sizes="100vw"
+        sizes="(max-width: 500px) 100vw, 500px"
         className={styles.image}
       />
     </div>

src/app/splash/components/splash-button.module.css

@@ -34,10 +34,11 @@
   padding: 0 30px;
   border: 0;
   border-radius: 24px;
+  /* 渐变色引用 tokens/colors.css 中定义的 token */
   background: linear-gradient(
     to right,
-    #fff96ade,
-    #fff657a0
+    var(--color-button-gradient-start),
+    var(--color-button-gradient-end)
   );
   color: #ffffff;
   font-weight: 700;

src/data/services/api/auth_api.ts

@@ -21,7 +21,7 @@ import { RefreshTokenResponse } from "@/data/dto/auth/refresh_token_response";
 import { RegisterRequest } from "@/data/dto/auth/register_request";
 import { SendCodeRequest } from "@/data/dto/auth/send_code_request";
 import { User } from "@/data/dto/user/user";
-import type { UserData } from "@/data/schemas/user/user";
+import type { UserData } from "@/data/services/schemas/user/user";
 
 export class AuthApi {
   /**

src/data/services/api/user_api.ts

@@ -12,7 +12,7 @@ import { CreditsHistoryData } from "@/data/dto/user/credits_history_data";
 import { UpdateProfileRequest } from "@/data/dto/user/update_profile_request";
 import { User } from "@/data/dto/user/user";
 import { UserStatsResponse } from "@/data/dto/user/user_stats_response";
-import type { UserData } from "@/data/schemas/user/user";
+import type { UserData } from "@/data/services/schemas/user/user";
 
 export class UserApi {
   /**

src/data/services/dto/auth/apple_login_request.ts

@@ -5,7 +5,7 @@ import {
   AppleLoginRequestSchema,
   type AppleLoginRequestInput,
   type AppleLoginRequestData,
-} from "@/data/schemas/auth/apple_login_request";
+} from "@/data/services/schemas/auth/apple_login_request";
 
 export class AppleLoginRequest {
   declare readonly identityToken: string;

src/data/services/dto/auth/facebook_login_request.ts

@@ -5,7 +5,7 @@ import {
   FacebookLoginRequestSchema,
   type FacebookLoginRequestInput,
   type FacebookLoginRequestData,
-} from "@/data/schemas/auth/facebook_login_request";
+} from "@/data/services/schemas/auth/facebook_login_request";
 
 export class FacebookLoginRequest {
   declare readonly accessToken: string;

src/data/services/dto/auth/facebook_user_data.ts

@@ -7,7 +7,7 @@ import {
   FacebookUserDataSchema,
   type FacebookUserDataInput,
   type FacebookUserDataData,
-} from "@/data/schemas/auth/facebook_user_data";
+} from "@/data/services/schemas/auth/facebook_user_data";
 
 export class FacebookUserData {
   declare readonly id: string | null;

src/data/services/dto/auth/fb_id_login_request.ts

@@ -5,7 +5,7 @@ import {
   FbIdLoginRequestSchema,
   type FbIdLoginRequestInput,
   type FbIdLoginRequestData,
-} from "@/data/schemas/auth/fb_id_login_request";
+} from "@/data/services/schemas/auth/fb_id_login_request";
 
 export class FbIdLoginRequest {
   declare readonly fbId: string;

src/data/services/dto/auth/google_login_request.ts

@@ -5,7 +5,7 @@ import {
   GoogleLoginRequestSchema,
   type GoogleLoginRequestInput,
   type GoogleLoginRequestData,
-} from "@/data/schemas/auth/google_login_request";
+} from "@/data/services/schemas/auth/google_login_request";
 
 export class GoogleLoginRequest {
   declare readonly idToken: string;

src/data/services/dto/auth/guest_login_request.ts

@@ -5,7 +5,7 @@ import {
   GuestLoginRequestSchema,
   type GuestLoginRequestInput,
   type GuestLoginRequestData,
-} from "@/data/schemas/auth/guest_login_request";
+} from "@/data/services/schemas/auth/guest_login_request";
 
 export class GuestLoginRequest {
   declare readonly deviceId: string;

src/data/services/dto/auth/guest_login_response.ts

@@ -5,7 +5,7 @@ import {
   GuestLoginResponseSchema,
   type GuestLoginResponseInput,
   type GuestLoginResponseData,
-} from "@/data/schemas/auth/guest_login_response";
+} from "@/data/services/schemas/auth/guest_login_response";
 import { User } from "@/data/dto/user/user";
 
 export class GuestLoginResponse {

src/data/services/dto/auth/login_request.ts

@@ -5,7 +5,7 @@ import {
   LoginRequestSchema,
   type LoginRequestInput,
   type LoginRequestData,
-} from "@/data/schemas/auth/login_request";
+} from "@/data/services/schemas/auth/login_request";
 
 export class LoginRequest {
   declare readonly email: string;

src/data/services/dto/auth/login_response.ts

@@ -5,7 +5,7 @@ import {
   LoginResponseSchema,
   type LoginResponseInput,
   type LoginResponseData,
-} from "@/data/schemas/auth/login_response";
+} from "@/data/services/schemas/auth/login_response";
 import { User } from "@/data/dto/user/user";
 
 export class LoginResponse {

src/data/services/dto/auth/logout_response.ts

@@ -5,7 +5,7 @@ import {
   LogoutResponseSchema,
   type LogoutResponseInput,
   type LogoutResponseData,
-} from "@/data/schemas/auth/logout_response";
+} from "@/data/services/schemas/auth/logout_response";
 
 export class LogoutResponse {
   declare readonly success: boolean;

src/data/services/dto/auth/refresh_token_request.ts

@@ -5,7 +5,7 @@ import {
   RefreshTokenRequestSchema,
   type RefreshTokenRequestInput,
   type RefreshTokenRequestData,
-} from "@/data/schemas/auth/refresh_token_request";
+} from "@/data/services/schemas/auth/refresh_token_request";
 
 export class RefreshTokenRequest {
   declare readonly refreshToken: string;

src/data/services/dto/auth/refresh_token_response.ts

@@ -5,7 +5,7 @@ import {
   RefreshTokenResponseSchema,
   type RefreshTokenResponseInput,
   type RefreshTokenResponseData,
-} from "@/data/schemas/auth/refresh_token_response";
+} from "@/data/services/schemas/auth/refresh_token_response";
 
 export class RefreshTokenResponse {
   declare readonly token: string;

src/data/services/dto/auth/register_request.ts

@@ -5,7 +5,7 @@ import {
   RegisterRequestSchema,
   type RegisterRequestInput,
   type RegisterRequestData,
-} from "@/data/schemas/auth/register_request";
+} from "@/data/services/schemas/auth/register_request";
 
 export class RegisterRequest {
   declare readonly username: string;

src/data/services/dto/auth/send_code_request.ts

@@ -5,7 +5,7 @@ import {
   SendCodeRequestSchema,
   type SendCodeRequestInput,
   type SendCodeRequestData,
-} from "@/data/schemas/auth/send_code_request";
+} from "@/data/services/schemas/auth/send_code_request";
 
 export class SendCodeRequest {
   declare readonly email: string;

src/data/services/dto/chat/chat_history_response.ts

@@ -5,7 +5,7 @@ import {
   ChatHistoryResponseSchema,
   type ChatHistoryResponseInput,
   type ChatHistoryResponseData,
-} from "@/data/schemas/chat/chat_history_response";
+} from "@/data/services/schemas/chat/chat_history_response";
 import { ChatMessage } from "./chat_message";
 
 export class ChatHistoryResponse {

src/data/services/dto/chat/chat_message.ts

@@ -5,7 +5,7 @@ import {
   ChatMessageSchema,
   type ChatMessageInput,
   type ChatMessageData,
-} from "@/data/schemas/chat/chat_message";
+} from "@/data/services/schemas/chat/chat_message";
 
 export class ChatMessage {
   declare readonly role: string;

src/data/services/dto/chat/chat_send_response.ts

@@ -5,7 +5,7 @@ import {
   ChatSendResponseSchema,
   type ChatSendResponseInput,
   type ChatSendResponseData,
-} from "@/data/schemas/chat/chat_send_response";
+} from "@/data/services/schemas/chat/chat_send_response";
 
 export class ChatSendResponse {
   declare readonly mode: string;

src/data/services/dto/chat/chat_sync_data.ts

@@ -5,7 +5,7 @@ import {
   ChatSyncDataSchema,
   type ChatSyncDataInput,
   type ChatSyncDataData,
-} from "@/data/schemas/chat/chat_sync_data";
+} from "@/data/services/schemas/chat/chat_sync_data";
 
 export class ChatSyncData {
   declare readonly syncedCount: number;

src/data/services/dto/chat/chat_sync_request.ts

@@ -5,7 +5,7 @@ import {
   ChatSyncRequestSchema,
   type ChatSyncRequestInput,
   type ChatSyncRequestData,
-} from "@/data/schemas/chat/chat_sync_request";
+} from "@/data/services/schemas/chat/chat_sync_request";
 import { SyncMessage } from "./sync_message";
 
 export class ChatSyncRequest {

src/data/services/dto/chat/guest_chat_quota.ts

@@ -5,7 +5,7 @@ import {
   GuestChatQuotaSchema,
   type GuestChatQuotaInput,
   type GuestChatQuotaData,
-} from "@/data/schemas/chat/guest_chat_quota";
+} from "@/data/services/schemas/chat/guest_chat_quota";
 
 export class GuestChatQuota {
   // 静态常量

src/data/services/dto/chat/image_upload_response.ts

@@ -5,7 +5,7 @@ import {
   ImageUploadResponseSchema,
   type ImageUploadResponseInput,
   type ImageUploadResponseData,
-} from "@/data/schemas/chat/image_upload_response";
+} from "@/data/services/schemas/chat/image_upload_response";
 
 export class ImageUploadResponse {
   declare readonly success: boolean;

src/data/services/dto/chat/send_message_request.ts

@@ -5,7 +5,7 @@ import {
   SendMessageRequestSchema,
   type SendMessageRequestInput,
   type SendMessageRequestData,
-} from "@/data/schemas/chat/send_message_request";
+} from "@/data/services/schemas/chat/send_message_request";
 
 export class SendMessageRequest {
   declare readonly message: string;

src/data/services/dto/chat/stt_data.ts

@@ -5,7 +5,7 @@ import {
   SttDataSchema,
   type SttDataInput,
   type SttDataData,
-} from "@/data/schemas/chat/stt_data";
+} from "@/data/services/schemas/chat/stt_data";
 
 export class SttData {
   declare readonly text: string;

src/data/services/dto/chat/sync_message.ts

@@ -5,7 +5,7 @@ import {
   SyncMessageSchema,
   type SyncMessageInput,
   type SyncMessageData,
-} from "@/data/schemas/chat/sync_message";
+} from "@/data/services/schemas/chat/sync_message";
 
 export class SyncMessage {
   declare readonly role: string;

src/data/services/dto/metrics/app_event.ts

@@ -5,7 +5,7 @@ import {
   AppEventSchema,
   type AppEventInput,
   type AppEventData,
-} from "@/data/schemas/metrics/app_event";
+} from "@/data/services/schemas/metrics/app_event";
 
 export class AppEvent {
   declare readonly userId: string;

src/data/services/dto/metrics/pwa_event.ts

@@ -5,7 +5,7 @@ import {
   PwaEventSchema,
   type PwaEventInput,
   type PwaEventData,
-} from "@/data/schemas/metrics/pwa_event";
+} from "@/data/services/schemas/metrics/pwa_event";
 
 export class PwaEvent {
   declare readonly deviceId: string;

src/data/services/dto/user/avatar_data.ts

@@ -5,7 +5,7 @@ import {
   AvatarDataSchema,
   type AvatarDataInput,
   type AvatarDataData,
-} from "@/data/schemas/user/avatar_data";
+} from "@/data/services/schemas/user/avatar_data";
 
 export class AvatarData {
   declare readonly avatarUrl: string;

src/data/services/dto/user/credits_data.ts

@@ -5,7 +5,7 @@ import {
   CreditsDataSchema,
   type CreditsDataInput,
   type CreditsDataData,
-} from "@/data/schemas/user/credits_data";
+} from "@/data/services/schemas/user/credits_data";
 
 export class CreditsData {
   declare readonly userId: string;

src/data/services/dto/user/credits_history_data.ts

@@ -5,7 +5,7 @@ import {
   CreditsHistoryDataSchema,
   type CreditsHistoryDataInput,
   type CreditsHistoryDataData,
-} from "@/data/schemas/user/credits_history_data";
+} from "@/data/services/schemas/user/credits_history_data";
 
 export class CreditsHistoryData {
   declare readonly records: Record<string, unknown>[];

src/data/services/dto/user/personality_traits.ts

@@ -5,7 +5,7 @@ import {
   PersonalityTraitsSchema,
   type PersonalityTraitsInput,
   type PersonalityTraitsData,
-} from "@/data/schemas/user/personality_traits";
+} from "@/data/services/schemas/user/personality_traits";
 
 export class PersonalityTraits {
   declare readonly cheerful: number;

src/data/services/dto/user/recent_memory.ts

@@ -5,7 +5,7 @@ import {
   RecentMemorySchema,
   type RecentMemoryInput,
   type RecentMemoryData,
-} from "@/data/schemas/user/recent_memory";
+} from "@/data/services/schemas/user/recent_memory";
 
 export class RecentMemory {
   declare readonly type: string;

src/data/services/dto/user/update_profile_request.ts

@@ -5,7 +5,7 @@ import {
   UpdateProfileRequestSchema,
   type UpdateProfileRequestInput,
   type UpdateProfileRequestData,
-} from "@/data/schemas/user/update_profile_request";
+} from "@/data/services/schemas/user/update_profile_request";
 
 export class UpdateProfileRequest {
   declare readonly username: string;

src/data/services/dto/user/user.ts

@@ -5,7 +5,7 @@ import {
   UserSchema,
   type UserInput,
   type UserData,
-} from "@/data/schemas/user/user";
+} from "@/data/services/schemas/user/user";
 import { PersonalityTraits } from "./personality_traits";
 
 export class User {

src/data/services/dto/user/user_stats_response.ts

@@ -5,7 +5,7 @@ import {
   UserStatsResponseSchema,
   type UserStatsResponseInput,
   type UserStatsResponseData,
-} from "@/data/schemas/user/user_stats_response";
+} from "@/data/services/schemas/user/user_stats_response";
 import { PersonalityTraits } from "./personality_traits";
 import { RecentMemory } from "./recent_memory";
 

src/data/storage/chat/chat_storage.ts

@@ -18,7 +18,7 @@
 import {
   GuestChatQuotaSchema,
   type GuestChatQuotaData,
-} from "@/data/schemas/chat/guest_chat_quota";
+} from "@/data/services/schemas/chat/guest_chat_quota";
 import { z } from "zod";
 
 import { LocalStorage } from "../local_storage";

src/data/storage/chat/ichat_storage.ts

@@ -12,7 +12,7 @@
  */
 
 import type { Result } from "@/utils/result";
-import type { GuestChatQuotaData } from "@/data/schemas/chat/guest_chat_quota";
+import type { GuestChatQuotaData } from "@/data/services/schemas/chat/guest_chat_quota";
 
 export interface IChatStorage {
   getGuestDailyChatQuota(): Promise<Result<GuestChatQuotaData | null>>;

src/data/storage/user/iuser_storage.ts

@@ -12,7 +12,7 @@
  */
 
 import type { Result } from "@/utils/result";
-import type { UserData } from "@/data/schemas/user/user";
+import type { UserData } from "@/data/services/schemas/user/user";
 
 export interface IUserStorage {
   getUser(): Promise<Result<UserData | null>>;

src/data/storage/user/user_storage.ts

@@ -15,7 +15,7 @@
  *   - 单例挂在 class 静态字段，HMR 复用安全
  */
 
-import { UserSchema, type UserData } from "@/data/schemas/user/user";
+import { UserSchema, type UserData } from "@/data/services/schemas/user/user";
 import { LocalStorage } from "../local_storage";
 import { type Result as ResultT } from "@/utils/result";
 import { StorageKeys } from "../storage_keys";

src/tokens/colors.css

@@ -24,7 +24,6 @@
   --color-error: #ff4d4f;
   --color-warning: #ffa940;
 
-  /* ==================== Splash 页面 Facebook 按钮 ==================== */
   --color-button-gradient-start: #ff67e0;
   --color-button-gradient-end: #ff52a2;