chore: add comprehensive documentation and testing infrastructure

## 文档（全部中文）
- AGENTS.md - 完整的 AI 编码指南（中文版）
- CONTRIBUTING.md - 贡献指南
- DEVELOPMENT.md - 开发文档
- DEPLOYMENT.md - 部署文档
- TESTING.md - 测试文档
- TROUBLESHOOTING.md - 问题排查指南
- FAQ.md - 常见问题
- WORKFLOW.md - 标准开发流程文档
## AI 工作流（9个详细工作流）
- feature-development.md - 新功能开发流程
- bug-fix.md - Bug 修复流程
- code-review.md - 代码审查流程
- testing.md - 测试编写流程
- release.md - 发布流程
- refactoring.md - 代码重构流程
- documentation.md - 文档更新流程
- performance-optimization.md - 性能优化流程
- security-audit.md - 安全审计流程
## 测试基础设施
- vitest.config.ts - Vitest 单元测试配置
- playwright.config.ts - Playwright E2E 测试配置
- src/__tests__/setup.ts - 测试环境设置
- src/__tests__/unit/downloadStatus.test.ts - 示例单元测试
- e2e/basic.spec.ts - 示例 E2E 测试
## CI/CD
- .github/workflows/test.yml - 新建测试 CI 工作流
- .github/workflows/build.yml - 更新构建工作流，添加测试步骤
## Issue 模板
- 更新 bug_report.md 为标准 Bug 报告模板
- 更新 help_wanted.md 为标准功能请求模板
## 配置更新
- package.json - 添加测试依赖和 7 个新的 npm 脚本
- .gitignore - 添加测试相关忽略项
## 新增 npm 脚本
- test - 运行单元测试
- test:watch - 监听模式
- test:coverage - 生成覆盖率报告
- test:e2e - 运行 E2E 测试
- test:e2e:ui - E2E UI 模式
- test:e2e:debug - E2E 调试模式
- test:all - 运行所有测试
## 新增测试依赖
- @playwright/test ^1.40.0
- @testing-library/jest-dom ^6.1.5
- @testing-library/vue ^8.0.1
- @vitest/coverage-v8 ^1.0.0
- @vue/test-utils ^2.4.3
- jsdom ^23.0.1
- vitest ^1.0.0

.github/workflows/build.yml

@@ -15,6 +15,7 @@ on:
       - ".gitignore"
       - ".github/**"
       - "!.github/workflows/build.yml"
+      - "!.github/workflows/test.yml"
   pull_request:
     branches: [main]
     paths-ignore:
@@ -32,7 +33,28 @@ permissions:
   contents: write
 
 jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 20
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm run test
+
+      - name: Run lint
+        run: npm run lint
+
   build:
+    needs: test
     runs-on: ${{ matrix.os }}
     container: ${{ matrix.docker_image }}
 
@@ -46,7 +68,6 @@ jobs:
             docker_image: "debian:12"
           - package: rpm
             docker_image: "almalinux:8"
-      
 
     steps:
       - name: Install Build Dependencies
@@ -71,7 +92,7 @@ jobs:
           node-version: 20
 
       - name: Install Dependencies
-        run: | 
+        run: |
           npm install
 
       - name: Download host-spawn
@@ -119,4 +140,4 @@ jobs:
           files: |
             artifacts/**/*.deb
             artifacts/**/*.rpm
-          generate_release_notes: true
+          generate_release_notes: true

.github/workflows/test.yml

@@ -0,0 +1,83 @@
+name: Test
+
+on:
+  push:
+    branches: [main, develop]
+  pull_request:
+    branches: [main, develop]
+
+jobs:
+  unit-tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 20
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run unit tests
+        run: npm run test -- --coverage
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          files: ./coverage/lcov.info
+          flags: unittests
+          name: codecov-umbrella
+
+  e2e-tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 20
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Install Playwright Browsers
+        run: npx playwright install --with-deps chromium
+
+      - name: Run E2E tests
+        run: npm run test:e2e
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v6
+        with:
+          name: playwright-report
+          path: playwright-report/
+          retention-days: 30
+
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 20
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run ESLint
+        run: npm run lint
+
+      - name: Check formatting
+        run: npm run format -- --check