fix(web): add /uploads/* rewrite for self-hosted deployments

On self-hosted deployments where the frontend is the public entrypoint,
uploaded files return 404 because /uploads/* requests aren't proxied to
the backend. Add a rewrite rule following the existing pattern for /api/*,
/ws, and /auth/*.

Closes #1004

apps/web/next.config.ts

@@ -45,6 +45,10 @@ const nextConfig: NextConfig = {
         source: "/auth/:path*",
         destination: `${remoteApiUrl}/auth/:path*`,
       },
+      {
+        source: "/uploads/:path*",
+        destination: `${remoteApiUrl}/uploads/:path*`,
+      },
     ];
   },
 };