feat(chat): render commercial actions and persist greetings

e2e/fixtures/api/chat.ts

@@ -20,6 +20,23 @@ export interface ChatMockState {
 export async function registerChatMocks(page: Page, options: ChatMockOptions, state: ChatMockState) {
   let sendCount = 0;
 
+  await page.route("**/api/chat/opening-message", async (route) => {
+    const body = route.request().postDataJSON() as {
+      openingMessage?: unknown;
+    } | undefined;
+    await route.fulfill({
+      json: apiEnvelope({
+        messageId: "mock-opening-message",
+        created: true,
+        openingMessage:
+          typeof body?.openingMessage === "string"
+            ? body.openingMessage
+            : "Hello",
+        createdAt: "2026-07-23T00:00:00Z",
+      }),
+    });
+  });
+
   await page.route("**/api/chat/history**", async (route) => {
     const response = options.paidVoiceInsufficientCreditsFlow
       ? paidVoiceHistoryResponse
@@ -44,7 +61,21 @@ export async function registerChatMocks(page: Page, options: ChatMockOptions, st
       await route.fulfill({ status: 401, json: { message: "expired" } });
       return;
     }
-    const response = options.paidImageFlow && message.includes("给我发图片")
+    const response = message.includes("private album offer test")
+      ? {
+          ...chatSendResponse,
+          reply: "You always know how to make me smile.",
+          messageId: "commercial-action-message",
+          commercialAction: {
+            actionId: "commercial-action-1",
+            type: "privateAlbumOffer",
+            copy: "There are more private photos waiting for you.",
+            ctaLabel: "Open private zone",
+            target: "privateZone",
+            ruleId: "private_album_after_appearance_praise",
+          },
+        }
+      : options.paidImageFlow && message.includes("给我发图片")
       ? paidImageChatSendResponse
       : options.chatLimitTriggerAt != null && sendCount >= options.chatLimitTriggerAt
         ? createWeeklyLimitChatSendResponse(sendCount, options.chatLimitTriggerAt)