Add client-side spell column sorting and improve inventory search

- Implement client-side sorting for all columns including spell_names
- Add computed_spell_names CTE for server-side sort fallback
- Add resizable columns with localStorage persistence
- Add Cloak slot detection by name pattern
- Increase items limit to 50000 for full inventory loading
- Increase proxy timeout to 60s for large queries
- Remove pagination (all items loaded at once for sorting)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

main.py

@@ -2275,8 +2275,8 @@ async def proxy_inventory_service(path: str, request: Request):
         inventory_service_url = os.getenv('INVENTORY_SERVICE_URL', 'http://inventory-service:8000')
         logger.info(f"Proxying to inventory service: {inventory_service_url}/{path}")
         
-        # Forward the request to inventory service
-        async with httpx.AsyncClient() as client:
+        # Forward the request to inventory service (60s timeout for large queries)
+        async with httpx.AsyncClient(timeout=60.0) as client:
             response = await client.request(
                 method=request.method,
                 url=f"{inventory_service_url}/{path}",