fix: resolve 10 code review issues

High priority:
- Fix concurrent race condition for view_count/like_count (atomic update)
- Add route request ID tracking to prevent race conditions
- Filter get_joke by status=approved (no pending content leak)
- Add error feedback for like button

Performance:
- Optimize random joke query (avoid full table sort)
- Limit page_size max to 100 (DoS prevention)

Medium:
- Add localStorage quota error handling
- Handle empty AI response gracefully
- Fix generate content title extraction

Low:
- Add rejected_jokes to stats API
- Update dashboard to show rejected count

admin/src/api/category.js

@@ -1,7 +1,7 @@
 import request from './request'
 
-export const getTypes = () => request.get('/types')
-export const getCrowds = () => request.get('/crowds')
+export const getTypes = () => request.get('/categories/types')
+export const getCrowds = () => request.get('/categories/crowds')
 export const createType = data => request.post('/admin/types', data)
 export const updateType = (id, data) => request.put(`/admin/types/${id}`, data)
 export const deleteType = id => request.delete(`/admin/types/${id}`)