feat: add frontend development guidelines and structure documentation

- Introduced API guidelines for interface contracts and request handling.
- Added design tokens usage guidelines for consistent styling across the project.
- Established DTO guidelines for defining request parameters and response data types.
- Created frontend structure guidelines to clarify directory organization and code placement rules.
- Compiled a comprehensive frontend development guideline document covering various aspects of the development process.
- Implemented quality guidelines to ensure code maintainability and adherence to best practices.

AI-RD-Workflow/40-workflows/se-workflow.md

@@ -0,0 +1,16 @@
+---
+id: SE-WORKFLOW-AI-RD
+type: workflow
+status: draft
+created: 2026-06-29
+---
+
+# SE 工作流
+
+1. 接收 PM 侧 UR、RA、SA。
+2. 使用 `se-requirement-review` 判断工程就绪度。
+3. 对阻塞问题回传 PM。
+4. 使用 `se-requirement-analysis` 生成 OR、DR。
+5. 更新 case 的 `traceability.md`。
+6. 进入 Gate 2 研发需求评审。
+7. 评审通过后交给 RD。