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/90-archive/index.md

@@ -0,0 +1,16 @@
+---
+id: ARCHIVE-INDEX-AI-RD-WORKFLOW
+type: archive-index
+status: draft
+created: 2026-06-29
+---
+
+# 归档
+
+存放废弃方案、历史版本和不再推荐使用的实验材料。
+
+归档文件应说明：
+
+- 归档原因。
+- 替代方案。
+- 归档日期。