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/vite.config.js

@@ -13,7 +13,7 @@ export default defineConfig({
     port: 3001,
     proxy: {
       '/api': {
-        target: 'http://localhost:8000',
+        target: 'http://localhost:8001',
         changeOrigin: true
       }
     }