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/60-evaluations/skill-eval-cases/index.md

@@ -0,0 +1,22 @@
+---
+id: SKILL-EVAL-CASES-INDEX
+type: evaluation-index
+status: draft
+created: 2026-06-29
+---
+
+# Skill 评测用例
+
+用于保存可重复执行的 skill 评测样本。
+
+建议结构：
+
+```text
+skill-eval-cases/
+├── pm-requirement-review/
+├── pm-requirement-refine/
+├── se-requirement-review/
+├── se-requirement-analysis/
+├── rd-design-generate/
+└── test-case-generate/
+```