feat:add ai client#61

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xiaocheny214 wants to merge 13 commits into

1024XEngineer:mainfrom

xiaocheny214:feat/add-AI-Client

Commits on Jul 23, 2026

feat: add backend skeleton
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Commits on Jul 24, 2026

Commits on Jul 25, 2026

feat(common): add unified response, exception hierarchy and biz code enum
xiaocheny214
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feat(app): add global exception handlers and mount on app
xiaocheny214
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feat(common): add ListResponse with pagination fields
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