Update dashboard community links to use env vars, add deploy configs

- Dashboard community links now use .env values like community page
- Removed hardcoded social media URLs from dashboard
- Added deploy folder with nginx and systemd service configs
- Moved linktree page to public route
- Various backend and auth context updates

backend/src/index.ts

@@ -25,10 +25,14 @@ const app = new Hono();
 
 // Middleware
 app.use('*', logger());
-app.use('*', cors({
-  origin: process.env.FRONTEND_URL || 'http://localhost:3002',
-  credentials: true,
-}));
+
+// CORS: Only enable in development. In production, nginx handles CORS.
+if (process.env.NODE_ENV !== 'production') {
+  app.use('*', cors({
+    origin: process.env.FRONTEND_URL || 'http://localhost:3002',
+    credentials: true,
+  }));
+}
 
 // OpenAPI specification
 const openApiSpec = {