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/request.js

@@ -1,6 +1,10 @@
 import axios from 'axios'
 
-export default axios.create({
+const request = axios.create({
   baseURL: '/api',
   timeout: 10000
 })
+
+request.interceptors.response.use(res => res.data)
+
+export default request