Connect frontend to oRPC server

- Add Vite proxy to forward /api/v1/rpc to API server (port 9861)
- Create oRPC client in src/lib/api/client.ts
- Add @orpc/client and @orpc/contract dependencies
- Add @reviq/api-contract workspace dependency
- Extract DEFAULT_PORT constant to api-server/src/constants.ts
- Change API server default port from 3001 to 9861

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

apps/api-server/src/constants.ts

@@ -0,0 +1,4 @@
+/**
+ * Default port for the API server
+ */
+export const DEFAULT_PORT = 9861;