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

web/src/api/joke.js

@@ -1,6 +1,7 @@
 import request from './request'
 
-export const getJokes = params => request.get('/jokes', { params })
+export const getJokes = params => request.get('/jokes/', { params })
 export const getJoke = id => request.get(`/jokes/${id}`)
 export const getRandomJoke = () => request.get('/jokes/random')
-export const searchJokes = params => request.get('/search', { params })
+export const likeJoke = id => request.post(`/jokes/${id}/like`)
+export const searchJokes = params => request.get('/jokes/', { params })