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 Coding/maintenance/conflicts.md

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+# Conflicts
+
+当前没有待处理冲突。

AI Coding/maintenance/index.md

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+# Maintenance
+
+- [[conflicts]]：互相冲突、需要进一步验证的经验
+- [[promotion-queue]]：已满足证据条件、等待提升的经验
+- [[stale]]：当前真实性不足或执行资产已经漂移的经验
+
+年龄本身不是过期证据。应根据代码、工具、文档和实际行为判断。

AI Coding/maintenance/promotion-queue.md

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+# Promotion Queue
+
+当前没有等待提升的经验。

AI Coding/maintenance/stale.md

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+# Stale
+
+当前没有标记为 stale 的经验。