feat(web): support REMOTE_API_URL env for proxying to remote backend

- Load root .env in next.config.ts so REMOTE_API_URL is available
- Default fallback remains localhost:8080 (no impact on existing setups)
- Add REMOTE_API_URL to .env.example with documentation

.env.example

@@ -44,3 +44,7 @@ FRONTEND_PORT=3000
 FRONTEND_ORIGIN=http://localhost:3000
 NEXT_PUBLIC_API_URL=http://localhost:8080
 NEXT_PUBLIC_WS_URL=ws://localhost:8080/ws
+
+# Remote API (optional) — set to proxy local frontend to a remote backend
+# Leave empty to use local backend (localhost:8080)
+# REMOTE_API_URL=https://multica-api.copilothub.ai

apps/web/next.config.ts

@@ -1,6 +1,11 @@
 import type { NextConfig } from "next";
+import { config } from "dotenv";
+import { resolve } from "path";
 
-const remoteApiUrl = process.env.REMOTE_API_URL ?? "https://multica-api.copilothub.ai";
+// Load root .env so REMOTE_API_URL is available to next.config.ts
+config({ path: resolve(__dirname, "../../.env") });
+
+const remoteApiUrl = process.env.REMOTE_API_URL || "http://localhost:8080";
 
 const nextConfig: NextConfig = {
   async rewrites() {