test: 添加完整测试套件（52 个文件，326 个用例）

基于 Vitest 搭建测试基础设施，覆盖后端纯函数、API 路由、
前端 hooks、UI 组件和页面级集成测试。

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

@@ -0,0 +1,51 @@
+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 { GET } from "./route";
+
+const mockCtx = { params: Promise.resolve({}) };
+
+beforeEach(() => {
+  resetPrismaMock();
+});
+
+describe("GET /api/blindbox/rooms", () => {
+  it("returns user rooms list", async () => {
+    prismaMock.blindBoxMember.findMany.mockResolvedValue([
+      {
+        room: {
+          id: "bb-room-1",
+          code: "ABC123",
+          name: "周末",
+          creatorId: "user-1",
+          _count: { members: 2, ideas: 5 },
+          members: [
+            { user: { id: "user-1", username: "test", avatar: "🐱" } },
+          ],
+          ideas: [{ content: "去公园", createdAt: new Date() }],
+        },
+        joinedAt: new Date(),
+      },
+    ] as never);
+
+    prismaMock.blindBoxIdea.groupBy.mockResolvedValue([
+      { roomId: "bb-room-1", _count: 3 },
+    ] as never);
+
+    const req = createRequest("/api/blindbox/rooms?userId=user-1");
+    const res = await GET(req, mockCtx);
+    const { status, data } = await parseJsonResponse(res);
+
+    expect(status).toBe(200);
+    expect(data.rooms).toHaveLength(1);
+    expect(data.rooms[0].code).toBe("ABC123");
+    expect(data.rooms[0].poolCount).toBe(3);
+  });
+
+  it("returns 401 when no userId", async () => {
+    const req = createRequest("/api/blindbox/rooms");
+    const res = await GET(req, mockCtx);
+    expect(res.status).toBe(401);
+  });
+});