feat: add Settings page with hijri seasons CRUD

- Server: seasons CRUD routes + generic NocoDB helpers
- Client: Settings page at /settings with inline add/edit/delete
- Seasons stored in NocoDB Seasons table
- Vite proxy: /api/seasons routed to Express server
- Nav links added (desktop + mobile)
- Locale keys for EN + AR
- Seasons loaded non-blocking on app mount

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vite.config.ts

@@ -10,6 +10,14 @@ export default defineConfig({
         target: 'http://localhost:3002',
         changeOrigin: true,
       },
+      '/api/etl': {
+        target: 'http://localhost:3002',
+        changeOrigin: true,
+      },
+      '/api/seasons': {
+        target: 'http://localhost:3002',
+        changeOrigin: true,
+      },
       '/api': {
         target: 'http://localhost:8090',
         changeOrigin: true,