docs: 修订宪章至 v2.2.0（新增文档规范原则）

新增 Principle VII: Documentation Standards（文档规范）

主要变更：
- 规定功能总结文档必须放在 docs/{feature-id}/ 目录，对应 specs/{feature-id}/
- 要求总结文档使用中文命名（功能总结.md、使用指南.md、架构说明.md）
- 要求总结文档内容使用中文编写，方便中文团队阅读
- 强制要求每次完成功能后更新 README.md，添加 2-3 句简短描述
- 目标：让首次接触项目的开发者能快速了解功能

模板同步更新：
- plan-template.md: 添加文档结构说明和 Documentation Standards 检查项
- tasks-template.md: 新增文档任务模板和文档相关质量检查项

版本升级理由：
MINOR 版本升级（2.1.1 → 2.2.0），因为新增了影响开发工作流程的强制性原则，
要求所有功能完成后必须创建中文总结文档并更新 README.md

.specify/templates/tasks-template.md

@@ -166,7 +166,15 @@ Foundational tasks for 君鸿卡管系统 tech stack:
 
 **Purpose**: Improvements that affect multiple user stories and final quality checks
 
-- [ ] TXXX [P] Documentation updates in docs/
+### Documentation (Constitution Principle VII - REQUIRED)
+
+- [ ] TXXX [P] Create feature summary doc in docs/{feature-id}/功能总结.md (Chinese filename and content)
+- [ ] TXXX [P] Create usage guide in docs/{feature-id}/使用指南.md (Chinese filename and content)
+- [ ] TXXX [P] Create architecture doc in docs/{feature-id}/架构说明.md (optional, Chinese filename and content)
+- [ ] TXXX Update README.md with brief feature description (2-3 sentences in Chinese)
+
+### Code Quality
+
 - [ ] TXXX Code cleanup and refactoring
 - [ ] TXXX Performance optimization and load testing (verify P95 < 200ms, P99 < 500ms)
 - [ ] TXXX [P] Additional unit tests to reach 70%+ coverage (90%+ for core business)
@@ -190,6 +198,9 @@ Foundational tasks for 君鸿卡管系统 tech stack:
 - [ ] TXXX Quality Gate: Verify Go naming conventions (UserID not userId, HTTPServer not HttpServer)
 - [ ] TXXX Quality Gate: Verify error handling is explicit (no panic/recover abuse)
 - [ ] TXXX Quality Gate: Verify uses goroutines/channels (not thread pool patterns)
+- [ ] TXXX Quality Gate: Verify feature summary docs created in docs/{feature-id}/ with Chinese filenames
+- [ ] TXXX Quality Gate: Verify summary doc content uses Chinese
+- [ ] TXXX Quality Gate: Verify README.md updated with brief feature description (2-3 sentences)
 
 ---