feat: 自动化项目丰富 - 添加 CI/CD、实战案例和提示词

## 新增内容

### GitHub Actions 工作流
- ci.yml: Markdown lint、链接检查、项目结构验证
- welcome.yml: 自动欢迎新贡献者
- labeler.yml: PR 自动标签

### Issue 模板
- prompt_contribution.md: 提示词贡献模板
- documentation.md: 文档改进模板
- config.yml: 模板配置（含社区链接）

### 实战案例
- 02-blog-system.md: 个人博客系统（Next.js + MDX）
- 04-cli-tool.md: 命令行工具（Python + Click）
- 05-chrome-extension.md: Chrome 扩展（网页笔记助手）

### 编程提示词
- debug-expert.md: 调试专家提示词
- code-review.md: 代码审查提示词
- architecture-design.md: 架构设计提示词

## 相关 Issues
- #5 完善 Wiki 文档
- #6 添加更多实战案例
- #7 扩充提示词库
- #8 激活社区讨论

.github/workflows/ci.yml

@@ -0,0 +1,60 @@
+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+jobs:
+  lint-markdown:
+    name: Lint Markdown
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+      - name: Install markdownlint-cli
+        run: npm install -g markdownlint-cli
+      - name: Run markdownlint
+        run: markdownlint '**/*.md' --ignore node_modules --ignore libs/external || true
+
+  check-links:
+    name: Check Links
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Link Checker
+        uses: lycheeverse/lychee-action@v1
+        with:
+          args: --verbose --no-progress './**/*.md' --exclude-path libs/external
+          fail: false
+
+  validate-structure:
+    name: Validate Project Structure
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check required files
+        run: |
+          echo "Checking required files..."
+          files=("README.md" "LICENSE" "CONTRIBUTING.md" "CODE_OF_CONDUCT.md" "AGENTS.md" "CLAUDE.md")
+          for file in "${files[@]}"; do
+            if [ -f "$file" ]; then
+              echo "✓ $file exists"
+            else
+              echo "✗ $file missing"
+            fi
+          done
+      - name: Check i18n structure
+        run: |
+          echo "Checking i18n directories..."
+          for lang in zh en; do
+            if [ -d "i18n/$lang" ]; then
+              echo "✓ i18n/$lang exists"
+            else
+              echo "✗ i18n/$lang missing"
+            fi
+          done

.github/workflows/labeler.yml

@@ -0,0 +1,16 @@
+name: Auto Labeler
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - uses: actions/labeler@v5
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"

.github/workflows/welcome.yml

@@ -0,0 +1,42 @@
+name: Welcome New Contributors
+
+on:
+  issues:
+    types: [opened]
+  pull_request:
+    types: [opened]
+
+jobs:
+  welcome:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/first-interaction@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          issue-message: |
+            👋 感谢您提交第一个 Issue！
+
+            我们非常重视您的反馈。请确保：
+            - 已阅读 [贡献指南](CONTRIBUTING.md)
+            - 提供了足够的上下文信息
+            - 如果是 Bug，请提供复现步骤
+
+            我们会尽快回复您！🚀
+
+            ---
+            Thanks for opening your first issue! We'll get back to you soon.
+          pr-message: |
+            🎉 感谢您提交第一个 Pull Request！
+
+            这是您对本项目的首次贡献，我们非常感激！请确保：
+            - PR 描述清晰说明了改动内容
+            - 代码符合项目规范
+            - 已更新相关文档（如适用）
+
+            我们会尽快审核您的代码！💪
+
+            ---
+            Thanks for your first PR! We'll review it soon.