fix(web): remove API proxy, use direct backend requests

- Remove Next.js rewrites proxy configuration
- Use NEXT_PUBLIC_API_URL for direct API requests
- Fixes ECONNRESET errors from proxy failures

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

apps/web/.env.development

@@ -1 +1,4 @@
+# Frontend direct API request (browser-accessible)
+NEXT_PUBLIC_API_URL=https://api-dev.copilothub.ai
+# Core package still uses this
 MULTICA_API_URL=https://api-dev.copilothub.ai

apps/web/lib/constant.ts

@@ -1,2 +1,2 @@
-// API Host
-export const API_HOST = process.env.NEXT_PUBLIC_API_HOST || '';
+// API Host - direct request to backend (no proxy)
+export const API_HOST = process.env.NEXT_PUBLIC_API_URL || process.env.NEXT_PUBLIC_API_HOST || '';

apps/web/next.config.ts

@@ -2,16 +2,7 @@ import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
   transpilePackages: ["@multica/ui", "@multica/store", "@multica/hooks", "@multica/sdk"],
-  rewrites: async () => {
-    const apiUrl = process.env.MULTICA_API_URL;
-    if (!apiUrl) return [];
-    return [
-      {
-        source: "/api/:path*",
-        destination: `${apiUrl}/api/:path*`,
-      },
-    ];
-  },
+  // Removed rewrites proxy - frontend requests API directly via NEXT_PUBLIC_API_URL
   headers: async () => [
     {
       source: "/sw.js",