feat(templates): add intelligent PR template selection system

- Created specialized PR templates for different change types:
  - Backend template for Go/API changes
  - Frontend template for UI/UX changes
  - Documentation template for docs updates
  - General template for mixed changes
- Simplified default template from 270 to 115 lines
- Added GitHub Action for automatic template suggestion based on file types
- Auto-labels PRs with appropriate categories (backend/frontend/documentation)
- Provides friendly suggestions when default template is used

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: tinkle-community <tinklefund@gmail.com>

.github/PULL_REQUEST_TEMPLATE/frontend.md

@@ -0,0 +1,129 @@
+# Pull Request - Frontend | 前端 PR
+
+> **💡 提示 Tip:** 推荐 PR 标题格式 `type(scope): description`
+> 例如: `feat(ui): add dark mode toggle` | `fix(form): resolve validation bug`
+
+---
+
+## 📝 Description | 描述
+
+**English:**
+
+
+**中文：**
+
+
+---
+
+## 🎯 Type of Change | 变更类型
+
+- [ ] 🐛 Bug fix | 修复 Bug
+- [ ] ✨ New feature | 新功能
+- [ ] 💥 Breaking change | 破坏性变更
+- [ ] 🎨 Code style update | 代码样式更新
+- [ ] ♻️ Refactoring | 重构
+- [ ] ⚡ Performance improvement | 性能优化
+
+---
+
+## 🔗 Related Issues | 相关 Issue
+
+- Closes # | 关闭 #
+- Related to # | 相关 #
+
+---
+
+## 📋 Changes Made | 具体变更
+
+**English:**
+-
+-
+
+**中文：**
+-
+-
+
+---
+
+## 📸 Screenshots / Demo | 截图/演示
+
+<!-- For UI changes, include before/after screenshots or video demo -->
+<!-- 对于 UI 变更，请包含变更前后的截图或视频演示 -->
+
+**Before | 变更前:**
+
+
+**After | 变更后:**
+
+
+---
+
+## 🧪 Testing | 测试
+
+### Test Environment | 测试环境
+- **OS | 操作系统:**
+- **Node Version | Node 版本:**
+- **Browser(s) | 浏览器:**
+
+### Manual Testing | 手动测试
+- [ ] Tested in development mode | 开发模式测试通过
+- [ ] Tested production build | 生产构建测试通过
+- [ ] Tested on multiple browsers | 多浏览器测试通过
+- [ ] Tested responsive design | 响应式设计测试通过
+- [ ] Verified no existing functionality broke | 确认没有破坏现有功能
+
+---
+
+## 🌐 Internationalization | 国际化
+
+- [ ] All user-facing text supports i18n | 所有面向用户的文本支持国际化
+- [ ] Both English and Chinese versions provided | 提供了中英文版本
+- [ ] N/A | 不适用
+
+---
+
+## ✅ Checklist | 检查清单
+
+### Code Quality | 代码质量
+- [ ] Code follows project style | 代码遵循项目风格
+- [ ] Self-review completed | 已完成代码自查
+- [ ] Comments added for complex logic | 已添加必要注释
+- [ ] Code builds successfully | 代码构建成功 (`npm run build`)
+- [ ] Ran `npm run lint` | 已运行 `npm run lint`
+- [ ] No console errors or warnings | 无控制台错误或警告
+
+### Testing | 测试
+- [ ] Component tests added/updated | 已添加/更新组件测试
+- [ ] Tests pass locally | 测试在本地通过
+
+### Documentation | 文档
+- [ ] Updated relevant documentation | 已更新相关文档
+- [ ] Updated type definitions (TypeScript) | 已更新类型定义
+- [ ] Added JSDoc comments where necessary | 已添加 JSDoc 注释
+
+### Git
+- [ ] Commits follow conventional format | 提交遵循 Conventional Commits 格式
+- [ ] Rebased on latest `dev` branch | 已 rebase 到最新 `dev` 分支
+- [ ] No merge conflicts | 无合并冲突
+
+---
+
+## 📚 Additional Notes | 补充说明
+
+**English:**
+
+
+**中文：**
+
+
+---
+
+**By submitting this PR, I confirm | 提交此 PR，我确认：**
+
+- [ ] I have read the [Contributing Guidelines](../../CONTRIBUTING.md) | 已阅读贡献指南
+- [ ] I agree to the [Code of Conduct](../../CODE_OF_CONDUCT.md) | 同意行为准则
+- [ ] My contribution is licensed under AGPL-3.0 | 贡献遵循 AGPL-3.0 许可证
+
+---
+
+🌟 **Thank you for your contribution! | 感谢你的贡献！**