fix: preserve query string in production API proxy

The SvelteKit hooks proxy was only forwarding pathname without
the query string (event.url.search), causing filters and pagination
to be silently dropped in production builds.

frontend/src/hooks.server.ts

@@ -67,14 +67,17 @@ export const handle: Handle = async ({ event, resolve }) => {
 		return proxyRequest(event.request, BACKEND_URL, '/health');
 	}
 
+	// Include query string for all API proxying
+	const fullPath = pathname + event.url.search;
+
 	// Proxy /api/v1/* to backend (must come before /api/* check)
 	if (pathname.startsWith('/api/v1/')) {
-		return proxyRequest(event.request, BACKEND_URL, pathname);
+		return proxyRequest(event.request, BACKEND_URL, fullPath);
 	}
 
 	// Proxy /api/* to Ollama
 	if (pathname.startsWith('/api/')) {
-		return proxyRequest(event.request, OLLAMA_URL, pathname);
+		return proxyRequest(event.request, OLLAMA_URL, fullPath);
 	}
 
 	// All other requests go to SvelteKit