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/index.ts

@@ -1,9 +1,10 @@
 import { RPCHandler } from "@orpc/server/fetch";
+import { DEFAULT_PORT } from "./constants.js";
 import { router } from "./router.js";
 
 const handler = new RPCHandler(router);
 
-const port = import.meta.env.PORT ?? 3001;
+const port = import.meta.env.PORT ?? DEFAULT_PORT;
 
 Bun.serve({
   port,