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/route.test.ts

@@ -2,6 +2,11 @@ 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";
+import { ApiError } from "@/lib/api";
+
+vi.mock("@/lib/auth", () => ({
+  getAuthUserId: vi.fn().mockResolvedValue("user-1"),
+}));
 
 vi.mock("@/lib/blindbox", () => ({
   requireMembership: vi.fn().mockResolvedValue({}),
@@ -21,11 +26,13 @@ vi.mock("@/lib/ai", () => ({
 }));
 
 import { POST, GET, PUT, DELETE } from "./route";
+import { getAuthUserId } from "@/lib/auth";
 
 const mockCtx = { params: Promise.resolve({}) };
 
 beforeEach(() => {
   resetPrismaMock();
+  vi.mocked(getAuthUserId).mockResolvedValue("user-1");
 });
 
 describe("POST /api/blindbox (create idea)", () => {
@@ -35,7 +42,7 @@ describe("POST /api/blindbox (create idea)", () => {
 
     const req = createRequest("/api/blindbox", {
       method: "POST",
-      body: { roomId: "bb-room-1", userId: "user-1", content: "去公园野餐" },
+      body: { roomId: "bb-room-1", content: "去公园野餐" },
     });
     const res = await POST(req, mockCtx);
     const { status, data } = await parseJsonResponse(res);
@@ -44,7 +51,8 @@ describe("POST /api/blindbox (create idea)", () => {
     expect(data.id).toBe("idea-1");
   });
 
-  it("returns 401 when no userId", async () => {
+  it("returns 401 when not authenticated", async () => {
+    vi.mocked(getAuthUserId).mockRejectedValueOnce(new ApiError("请先登录", 401));
     const req = createRequest("/api/blindbox", {
       method: "POST",
       body: { roomId: "bb-room-1", content: "test" },
@@ -56,7 +64,7 @@ describe("POST /api/blindbox (create idea)", () => {
   it("returns 400 when content is empty", async () => {
     const req = createRequest("/api/blindbox", {
       method: "POST",
-      body: { roomId: "bb-room-1", userId: "user-1", content: "" },
+      body: { roomId: "bb-room-1", content: "" },
     });
     const res = await POST(req, mockCtx);
     expect(res.status).toBe(400);
@@ -65,7 +73,7 @@ describe("POST /api/blindbox (create idea)", () => {
   it("returns 400 when content over 200 chars", async () => {
     const req = createRequest("/api/blindbox", {
       method: "POST",
-      body: { roomId: "bb-room-1", userId: "user-1", content: "a".repeat(201) },
+      body: { roomId: "bb-room-1", content: "a".repeat(201) },
     });
     const res = await POST(req, mockCtx);
     expect(res.status).toBe(400);
@@ -79,7 +87,7 @@ describe("GET /api/blindbox (get pool data)", () => {
       .mockResolvedValueOnce([TEST_BLINDBOX_IDEA] as never)
       .mockResolvedValueOnce([] as never);
 
-    const req = createRequest("/api/blindbox?userId=user-1&roomId=bb-room-1");
+    const req = createRequest("/api/blindbox?roomId=bb-room-1");
     const res = await GET(req, mockCtx);
     const { status, data } = await parseJsonResponse(res);
 
@@ -89,7 +97,8 @@ describe("GET /api/blindbox (get pool data)", () => {
     expect(data.drawn).toHaveLength(0);
   });
 
-  it("returns 401 when no userId", async () => {
+  it("returns 401 when not authenticated", async () => {
+    vi.mocked(getAuthUserId).mockRejectedValueOnce(new ApiError("请先登录", 401));
     const req = createRequest("/api/blindbox?roomId=bb-room-1");
     const res = await GET(req, mockCtx);
     expect(res.status).toBe(401);
@@ -102,7 +111,7 @@ describe("PUT /api/blindbox (edit idea)", () => {
 
     const req = createRequest("/api/blindbox", {
       method: "PUT",
-      body: { ideaId: "idea-1", userId: "user-1", content: "去公园散步" },
+      body: { ideaId: "idea-1", content: "去公园散步" },
     });
     const res = await PUT(req, mockCtx);
     const { status, data } = await parseJsonResponse(res);
@@ -116,7 +125,7 @@ describe("PUT /api/blindbox (edit idea)", () => {
 
     const req = createRequest("/api/blindbox", {
       method: "PUT",
-      body: { ideaId: "nonexistent", userId: "user-1", content: "test" },
+      body: { ideaId: "nonexistent", content: "test" },
     });
     const res = await PUT(req, mockCtx);
     expect(res.status).toBe(404);
@@ -129,7 +138,7 @@ describe("DELETE /api/blindbox (delete idea)", () => {
 
     const req = createRequest("/api/blindbox", {
       method: "DELETE",
-      body: { ideaId: "idea-1", userId: "user-1" },
+      body: { ideaId: "idea-1" },
     });
     const res = await DELETE(req, mockCtx);
     const { data } = await parseJsonResponse(res);
@@ -142,7 +151,7 @@ describe("DELETE /api/blindbox (delete idea)", () => {
 
     const req = createRequest("/api/blindbox", {
       method: "DELETE",
-      body: { ideaId: "nonexistent", userId: "user-1" },
+      body: { ideaId: "nonexistent" },
     });
     const res = await DELETE(req, mockCtx);
     expect(res.status).toBe(404);