chore: 清理旧测试基础设施并添加新测试框架

- 清理废弃的 CI/CD 工作流文件与 dogfood 输出
- 添加 vitest 测试环境配置（mocks、setup 文件）
- 添加算法、服务、页面、工具类的单元测试
- 更新 vitest 配置、依赖与文档

everything-is-suitable-uniapp/vitest.setup.ts

@@ -0,0 +1,38 @@
+import { vi } from 'vitest'
+
+const uni = {
+  getStorageSync: vi.fn((key: string) => {
+    const store: Record<string, string> = (globalThis as any).__uniStorage__ ?? {}
+    return store[key] ?? ''
+  }),
+  setStorageSync: vi.fn((key: string, value: any) => {
+    if (!(globalThis as any).__uniStorage__) (globalThis as any).__uniStorage__ = {}
+    ;(globalThis as any).__uniStorage__[key] = JSON.stringify(value)
+  }),
+  removeStorageSync: vi.fn((key: string) => {
+    if ((globalThis as any).__uniStorage__) delete (globalThis as any).__uniStorage__[key]
+  }),
+  clearStorageSync: vi.fn(() => {
+    ;(globalThis as any).__uniStorage__ = {}
+  }),
+  showToast: vi.fn(),
+  showLoading: vi.fn(),
+  hideLoading: vi.fn(),
+  showModal: vi.fn(),
+  navigateTo: vi.fn(),
+  navigateBack: vi.fn(),
+  redirectTo: vi.fn(),
+  switchTab: vi.fn(),
+  reLaunch: vi.fn(),
+  getSystemInfoSync: vi.fn(() => ({
+    platform: 'devtools',
+    screenWidth: 375,
+    screenHeight: 812,
+  })),
+}
+
+vi.stubGlobal('uni', uni)
+
+beforeEach(() => {
+  ;(globalThis as any).__uniStorage__ = {}
+})