refactor(P2/P3): 完成全部7批重构 — 模块化、SSE退避、无障碍、Zod校验、Server组件、Room关系化

批次A：重命名 + 路由拆分
- store.ts → roomRepository.ts，更新全部 import
- blindbox/plan/route.ts 精简为薄路由，业务逻辑抽取到 planActions.ts / planQueries.ts

批次B：blindboxPlanGen.ts 拆分（710行 → src/lib/plan/）
- agentPlan.ts：Agent 工具调用与系统提示
- legacyPlan.ts：非 Agent 备用生成逻辑
- ideaSelection.ts：Idea 筛选与 Slot 映射
- transitEnrichment.ts：交通信息查询与填充
- index.ts：runPlanGeneration 主入口

批次C：SSE 连接稳定性
- useRoomPolling.ts 加入指数退避重连（上限60s，含Jitter）
- plan/stream/route.ts 添加30s心跳 + abort信号清理

批次D：无障碍修复
- Modal：role=dialog、aria-modal、aria-labelledby
- AuthModal：aria-label关闭按钮、tablist/tab/aria-selected
- PlanItemEditModal、QrInviteModal：补全aria-label
- BlindboxPlan：图标按钮aria-label

批次E：Zod 引入
- src/lib/schemas/ai.ts：AI返回值 Schema（IdeaTagsSchema等5个）
- src/lib/schemas/requests.ts：请求体 Schema
- ai.ts 手工验证替换为 Zod safeParse

批次F：Server Components
- achievements/page.tsx → Server Component + AchievementsClient.tsx
- profile/page.tsx → Server Component + ProfileClient.tsx

批次G：Room 关系化模型
- prisma/schema.prisma：新增 RoomMember、RoomRestaurant、RoomLike、RoomSwipe 4张表
- migration：20260302010000_room_relational_model
- roomRepository.ts 完整重写（关系查询+应用锁）
- buildRoomStatus.ts 适配关系查询

测试：全部329个用例通过，修复68个因auth mock缺失导致的测试失败

src/app/api/blindbox/room/[code]/route.test.ts

@@ -3,6 +3,10 @@ import { prismaMock, resetPrismaMock } from "@/__tests__/helpers/prisma-mock";
 import { createRequest, createRouteContext, parseJsonResponse } from "@/__tests__/helpers/api-test-utils";
 import { TEST_BLINDBOX_ROOM, TEST_USER } from "@/__tests__/helpers/fixtures";
 
+vi.mock("@/lib/auth", () => ({
+  getAuthUserId: vi.fn().mockResolvedValue("user-1"),
+}));
+
 vi.mock("@/lib/blindbox", () => ({
   getRoomByCode: vi.fn(),
   requireMembership: vi.fn().mockResolvedValue({}),
@@ -10,12 +14,14 @@ vi.mock("@/lib/blindbox", () => ({
 
 import { GET, PATCH, DELETE } from "./route";
 import { getRoomByCode } from "@/lib/blindbox";
+import { getAuthUserId } from "@/lib/auth";
 
 const mockGetRoomByCode = vi.mocked(getRoomByCode);
 
 beforeEach(() => {
   resetPrismaMock();
   vi.clearAllMocks();
+  vi.mocked(getAuthUserId).mockResolvedValue("user-1");
 });
 
 describe("GET /api/blindbox/room/[code]", () => {
@@ -61,7 +67,7 @@ describe("PATCH /api/blindbox/room/[code]", () => {
 
     const req = createRequest("/api/blindbox/room/ABC123", {
       method: "PATCH",
-      body: { userId: "user-1", city: "上海", lat: 31.2, lng: 121.4 },
+      body: { city: "上海", lat: 31.2, lng: 121.4 },
     });
     const ctx = createRouteContext({ code: "ABC123" });
     const res = await PATCH(req, ctx);
@@ -76,7 +82,7 @@ describe("PATCH /api/blindbox/room/[code]", () => {
 
     const req = createRequest("/api/blindbox/room/ABC123", {
       method: "PATCH",
-      body: { userId: "user-1", lat: 999, lng: 121.4 },
+      body: { lat: 999, lng: 121.4 },
     });
     const ctx = createRouteContext({ code: "ABC123" });
     const res = await PATCH(req, ctx);
@@ -86,13 +92,11 @@ describe("PATCH /api/blindbox/room/[code]", () => {
 
 describe("DELETE /api/blindbox/room/[code]", () => {
   it("deletes room when creator", async () => {
+    // user-1 is creator (TEST_BLINDBOX_ROOM.creatorId = "user-1")
     prismaMock.blindBoxRoom.findUnique.mockResolvedValue(TEST_BLINDBOX_ROOM as never);
     prismaMock.blindBoxRoom.delete.mockResolvedValue({} as never);
 
-    const req = createRequest("/api/blindbox/room/ABC123", {
-      method: "DELETE",
-      body: { userId: "user-1" },
-    });
+    const req = createRequest("/api/blindbox/room/ABC123", { method: "DELETE", body: {} });
     const ctx = createRouteContext({ code: "ABC123" });
     const res = await DELETE(req, ctx);
     const { data } = await parseJsonResponse(res);
@@ -101,14 +105,13 @@ describe("DELETE /api/blindbox/room/[code]", () => {
   });
 
   it("leaves room when not creator", async () => {
+    // Authenticate as user-2 (not creator)
+    vi.mocked(getAuthUserId).mockResolvedValueOnce("user-2");
     prismaMock.blindBoxRoom.findUnique.mockResolvedValue(TEST_BLINDBOX_ROOM as never);
     prismaMock.blindBoxMember.findUnique.mockResolvedValue({ id: "member-2" } as never);
     prismaMock.blindBoxMember.delete.mockResolvedValue({} as never);
 
-    const req = createRequest("/api/blindbox/room/ABC123", {
-      method: "DELETE",
-      body: { userId: "user-2" },
-    });
+    const req = createRequest("/api/blindbox/room/ABC123", { method: "DELETE", body: {} });
     const ctx = createRouteContext({ code: "ABC123" });
     const res = await DELETE(req, ctx);
     const { data } = await parseJsonResponse(res);
@@ -117,13 +120,12 @@ describe("DELETE /api/blindbox/room/[code]", () => {
   });
 
   it("returns 403 when not a member and not creator", async () => {
+    // Authenticate as stranger (not creator, not member)
+    vi.mocked(getAuthUserId).mockResolvedValueOnce("stranger");
     prismaMock.blindBoxRoom.findUnique.mockResolvedValue(TEST_BLINDBOX_ROOM as never);
     prismaMock.blindBoxMember.findUnique.mockResolvedValue(null as never);
 
-    const req = createRequest("/api/blindbox/room/ABC123", {
-      method: "DELETE",
-      body: { userId: "stranger" },
-    });
+    const req = createRequest("/api/blindbox/room/ABC123", { method: "DELETE", body: {} });
     const ctx = createRouteContext({ code: "ABC123" });
     const res = await DELETE(req, ctx);
     expect(res.status).toBe(403);