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/ai-development-workflow.md

@@ -0,0 +1,31 @@
+---
+id: AI-DEVELOPMENT-WORKFLOW
+type: workflow
+status: draft
+created: 2026-06-29
+---
+
+# AI 开发工作流
+
+## 输入
+
+- 已通过评审的 DS。
+- 明确的 TASK。
+- 当前代码库上下文。
+- 测试命令和验收方式。
+
+## 执行
+
+1. 读取 TASK 和相关 DS。
+2. 定位受影响代码。
+3. 给出实现计划。
+4. 修改代码。
+5. 运行验证。
+6. 更新任务状态和风险说明。
+
+## 输出
+
+- 代码变更摘要。
+- 验证结果。
+- 未完成项。
+- 与需求 ID 的映射。