fix: 盲盒想法打标改为后台异步，新增 retag 补打接口

- applyTags 改为 fire-and-forget，用户投入想法立即返回（<200ms）
- 打标超时设为 60s，失败静默，由 /api/blindbox/retag 兜底
- 新增 POST /api/blindbox/retag：补打房间内所有无标签想法

src/app/api/blindbox/retag/route.test.ts

@@ -0,0 +1,71 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { prismaMock, resetPrismaMock } from "@/__tests__/helpers/prisma-mock";
+import { createRequest, parseJsonResponse } from "@/__tests__/helpers/api-test-utils";
+import { TEST_BLINDBOX_IDEA } from "@/__tests__/helpers/fixtures";
+
+vi.mock("@/lib/blindbox", () => ({
+  requireMembership: vi.fn().mockResolvedValue({}),
+}));
+
+vi.mock("@/lib/ai", () => ({
+  tagIdea: vi.fn().mockResolvedValue({
+    category: "outdoor",
+    timeSlot: "morning",
+    estimatedMinutes: 120,
+    costLevel: "free",
+    intensity: "active",
+    needsBooking: false,
+    searchQuery: "公园",
+    searchType: "category",
+  }),
+}));
+
+import { POST } from "./route";
+
+const mockCtx = { params: Promise.resolve({}) };
+
+beforeEach(() => {
+  resetPrismaMock();
+});
+
+describe("POST /api/blindbox/retag", () => {
+  it("retags untagged ideas and returns count", async () => {
+    const untaggedIdea = { ...TEST_BLINDBOX_IDEA, category: null };
+    prismaMock.blindBoxIdea.findMany.mockResolvedValue([untaggedIdea] as never);
+    prismaMock.blindBoxIdea.update.mockResolvedValue(TEST_BLINDBOX_IDEA as never);
+
+    const req = createRequest("/api/blindbox/retag", {
+      method: "POST",
+      body: { roomId: "bb-room-1", userId: "user-1" },
+    });
+    const res = await POST(req, mockCtx);
+    const { status, data } = await parseJsonResponse(res);
+
+    expect(status).toBe(200);
+    expect(data.retagged).toBe(1);
+    expect(data.total).toBe(1);
+  });
+
+  it("returns 0 when no untagged ideas", async () => {
+    prismaMock.blindBoxIdea.findMany.mockResolvedValue([] as never);
+
+    const req = createRequest("/api/blindbox/retag", {
+      method: "POST",
+      body: { roomId: "bb-room-1", userId: "user-1" },
+    });
+    const res = await POST(req, mockCtx);
+    const { status, data } = await parseJsonResponse(res);
+
+    expect(status).toBe(200);
+    expect(data.retagged).toBe(0);
+  });
+
+  it("returns 401 when no userId", async () => {
+    const req = createRequest("/api/blindbox/retag", {
+      method: "POST",
+      body: { roomId: "bb-room-1" },
+    });
+    const res = await POST(req, mockCtx);
+    expect(res.status).toBe(401);
+  });
+});

src/app/api/blindbox/retag/route.ts

@@ -0,0 +1,45 @@
+import { NextResponse } from "next/server";
+import { prisma } from "@/lib/prisma";
+import { requireMembership } from "@/lib/blindbox";
+import { apiHandler, requireUserId } from "@/lib/api";
+import { tagIdea } from "@/lib/ai";
+
+export const POST = apiHandler(async (req) => {
+  const { roomId, userId } = await req.json();
+
+  requireUserId(userId);
+  await requireMembership(roomId, userId);
+
+  // Find all untagged ideas in this room (any member's ideas)
+  const untagged = await prisma.blindBoxIdea.findMany({
+    where: { roomId, status: "in_pool", category: null },
+    select: { id: true, content: true },
+  });
+
+  if (untagged.length === 0) {
+    return NextResponse.json({ retagged: 0 });
+  }
+
+  let retagged = 0;
+  for (const idea of untagged) {
+    const tags = await tagIdea(idea.content);
+    if (tags) {
+      await prisma.blindBoxIdea.update({
+        where: { id: idea.id },
+        data: {
+          category: tags.category,
+          timeSlot: tags.timeSlot,
+          estimatedMinutes: tags.estimatedMinutes,
+          costLevel: tags.costLevel,
+          intensity: tags.intensity,
+          needsBooking: tags.needsBooking,
+          searchQuery: tags.searchQuery,
+          searchType: tags.searchType,
+        },
+      });
+      retagged++;
+    }
+  }
+
+  return NextResponse.json({ retagged, total: untagged.length });
+});

src/app/api/blindbox/route.test.ts

@@ -42,7 +42,6 @@ describe("POST /api/blindbox (create idea)", () => {
 
     expect(status).toBe(201);
     expect(data.id).toBe("idea-1");
-    expect(data.tags).toBeDefined();
   });
 
   it("returns 401 when no userId", async () => {

src/app/api/blindbox/route.ts

@@ -5,7 +5,29 @@ import { apiHandler, ApiError, requireUserId } from "@/lib/api";
 import { validateIdeaContent, requireString } from "@/lib/validation";
 import { tagIdea } from "@/lib/ai";
 
-const TAG_TIMEOUT_MS = 3000;
+const TAG_TIMEOUT_MS = 60_000;
+
+function applyTags(ideaId: string, content: string) {
+  const timeout = new Promise<null>((resolve) => setTimeout(() => resolve(null), TAG_TIMEOUT_MS));
+  Promise.race([tagIdea(content), timeout])
+    .then((tags) => {
+      if (!tags) return;
+      return prisma.blindBoxIdea.update({
+        where: { id: ideaId },
+        data: {
+          category: tags.category,
+          timeSlot: tags.timeSlot,
+          estimatedMinutes: tags.estimatedMinutes,
+          costLevel: tags.costLevel,
+          intensity: tags.intensity,
+          needsBooking: tags.needsBooking,
+          searchQuery: tags.searchQuery,
+          searchType: tags.searchType,
+        },
+      });
+    })
+    .catch(() => {});
+}
 
 export const POST = apiHandler(async (req) => {
   const { roomId, userId, content } = await req.json();
@@ -20,31 +42,9 @@ export const POST = apiHandler(async (req) => {
     data: { roomId, userId, content: trimmedContent },
   });
 
-  const tags = await Promise.race([
-    tagIdea(trimmedContent),
-    new Promise<null>((resolve) => setTimeout(() => resolve(null), TAG_TIMEOUT_MS)),
-  ]);
+  applyTags(idea.id, trimmedContent);
 
-  if (tags) {
-    await prisma.blindBoxIdea.update({
-      where: { id: idea.id },
-      data: {
-        category: tags.category,
-        timeSlot: tags.timeSlot,
-        estimatedMinutes: tags.estimatedMinutes,
-        costLevel: tags.costLevel,
-        intensity: tags.intensity,
-        needsBooking: tags.needsBooking,
-        searchQuery: tags.searchQuery,
-        searchType: tags.searchType,
-      },
-    });
-  }
-
-  return NextResponse.json(
-    { id: idea.id, ...tags && { tags } },
-    { status: 201 },
-  );
+  return NextResponse.json({ id: idea.id }, { status: 201 });
 });
 
 export const GET = apiHandler(async (req) => {
@@ -101,28 +101,9 @@ export const PUT = apiHandler(async (req) => {
 
   if (count === 0) throw new ApiError("想法不存在、已被抽中或无权编辑", 404);
 
-  const tags = await Promise.race([
-    tagIdea(trimmedContent),
-    new Promise<null>((resolve) => setTimeout(() => resolve(null), TAG_TIMEOUT_MS)),
-  ]);
+  applyTags(ideaId, trimmedContent);
 
-  if (tags) {
-    await prisma.blindBoxIdea.updateMany({
-      where: { id: ideaId, userId, status: "in_pool" },
-      data: {
-        category: tags.category,
-        timeSlot: tags.timeSlot,
-        estimatedMinutes: tags.estimatedMinutes,
-        costLevel: tags.costLevel,
-        intensity: tags.intensity,
-        needsBooking: tags.needsBooking,
-        searchQuery: tags.searchQuery,
-        searchType: tags.searchType,
-      },
-    });
-  }
-
-  return NextResponse.json({ id: ideaId, content: trimmedContent, ...tags && { tags } });
+  return NextResponse.json({ id: ideaId, content: trimmedContent });
 });
 
 export const DELETE = apiHandler(async (req) => {