test: 完善自动化测试体系（7个模块，73个任务）

系统性地修复、补充和强化项目的自动化测试能力：

1. 测试基础设施修复
   - 修复 stubConcurrencyCache 缺失方法和构造函数参数不匹配
   - 创建 testutil 共享包（stubs.go, fixtures.go, httptest.go）
   - 为所有 Stub 添加编译期接口断言

2. 中间件测试补充
   - 新增 JWT 认证中间件测试（有效/过期/篡改/缺失 Token）
   - 补充 rate_limiter 和 recovery 中间件测试场景

3. 网关核心路径测试
   - 新增账户选择、等待队列、流式响应、并发控制、计费、Claude Code 检测测试
   - 覆盖负载均衡、粘性会话、SSE 转发、槽位管理等关键逻辑

4. 前端测试体系（11个新测试文件，163个测试用例）
   - Pinia stores: auth, app, subscriptions
   - API client: 请求拦截器、响应拦截器、401 刷新
   - Router guards: 认证重定向、管理员权限、简易模式限制
   - Composables: useForm, useTableLoader, useClipboard
   - Components: LoginForm, ApiKeyCreate, Dashboard

5. CI/CD 流水线重构
   - 重构 backend-ci.yml 为统一的 ci.yml
   - 前后端 4 个并行 Job + Postgres/Redis services
   - Race 检测、覆盖率收集与门禁、Docker 构建验证

6. E2E 自动化测试
   - e2e-test.sh 自动化脚本（Docker 启动→健康检查→测试→清理）
   - 用户注册→登录→API Key→网关调用完整链路测试
   - Mock 模式和 API Key 脱敏支持

7. 修复预存问题
   - tlsfingerprint dialer_test.go 缺失 build tag 导致集成测试编译冲突

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/composables/__tests__/useForm.spec.ts

@@ -0,0 +1,143 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { setActivePinia, createPinia } from 'pinia'
+import { useForm } from '@/composables/useForm'
+import { useAppStore } from '@/stores/app'
+
+// Mock API 依赖（app store 内部引用了这些）
+vi.mock('@/api/admin/system', () => ({
+  checkUpdates: vi.fn(),
+}))
+vi.mock('@/api/auth', () => ({
+  getPublicSettings: vi.fn(),
+}))
+
+describe('useForm', () => {
+  let appStore: ReturnType<typeof useAppStore>
+
+  beforeEach(() => {
+    setActivePinia(createPinia())
+    appStore = useAppStore()
+    vi.clearAllMocks()
+  })
+
+  it('submit 期间 loading 为 true，完成后为 false', async () => {
+    let resolveSubmit: () => void
+    const submitFn = vi.fn(
+      () => new Promise<void>((resolve) => { resolveSubmit = resolve })
+    )
+
+    const { loading, submit } = useForm({
+      form: { name: 'test' },
+      submitFn,
+    })
+
+    expect(loading.value).toBe(false)
+
+    const submitPromise = submit()
+    // 提交中
+    expect(loading.value).toBe(true)
+
+    resolveSubmit!()
+    await submitPromise
+
+    expect(loading.value).toBe(false)
+  })
+
+  it('submit 成功时显示成功消息', async () => {
+    const submitFn = vi.fn().mockResolvedValue(undefined)
+    const showSuccessSpy = vi.spyOn(appStore, 'showSuccess')
+
+    const { submit } = useForm({
+      form: { name: 'test' },
+      submitFn,
+      successMsg: '保存成功',
+    })
+
+    await submit()
+
+    expect(showSuccessSpy).toHaveBeenCalledWith('保存成功')
+  })
+
+  it('submit 成功但无 successMsg 时不调用 showSuccess', async () => {
+    const submitFn = vi.fn().mockResolvedValue(undefined)
+    const showSuccessSpy = vi.spyOn(appStore, 'showSuccess')
+
+    const { submit } = useForm({
+      form: { name: 'test' },
+      submitFn,
+    })
+
+    await submit()
+
+    expect(showSuccessSpy).not.toHaveBeenCalled()
+  })
+
+  it('submit 失败时显示错误消息并抛出错误', async () => {
+    const error = Object.assign(new Error('提交失败'), {
+      response: { data: { message: '服务器错误' } },
+    })
+    const submitFn = vi.fn().mockRejectedValue(error)
+    const showErrorSpy = vi.spyOn(appStore, 'showError')
+
+    const { submit, loading } = useForm({
+      form: { name: 'test' },
+      submitFn,
+    })
+
+    await expect(submit()).rejects.toThrow('提交失败')
+
+    expect(showErrorSpy).toHaveBeenCalled()
+    expect(loading.value).toBe(false)
+  })
+
+  it('submit 失败时使用自定义 errorMsg', async () => {
+    const submitFn = vi.fn().mockRejectedValue(new Error('network'))
+    const showErrorSpy = vi.spyOn(appStore, 'showError')
+
+    const { submit } = useForm({
+      form: { name: 'test' },
+      submitFn,
+      errorMsg: '自定义错误提示',
+    })
+
+    await expect(submit()).rejects.toThrow()
+
+    expect(showErrorSpy).toHaveBeenCalledWith('自定义错误提示')
+  })
+
+  it('loading 中不会重复提交', async () => {
+    let resolveSubmit: () => void
+    const submitFn = vi.fn(
+      () => new Promise<void>((resolve) => { resolveSubmit = resolve })
+    )
+
+    const { submit } = useForm({
+      form: { name: 'test' },
+      submitFn,
+    })
+
+    // 第一次提交
+    const p1 = submit()
+    // 第二次提交（应被忽略，因为 loading=true）
+    submit()
+
+    expect(submitFn).toHaveBeenCalledTimes(1)
+
+    resolveSubmit!()
+    await p1
+  })
+
+  it('传递 form 数据到 submitFn', async () => {
+    const formData = { name: 'test', email: 'test@example.com' }
+    const submitFn = vi.fn().mockResolvedValue(undefined)
+
+    const { submit } = useForm({
+      form: formData,
+      submitFn,
+    })
+
+    await submit()
+
+    expect(submitFn).toHaveBeenCalledWith(formData)
+  })
+})