Remove client-side Wren API key validation

The config.ts file was still checking for NEXT_PUBLIC_WREN_API_TOKEN
which no longer exists after moving to server-side proxy routes.

Changes:
- Remove all client-side environment variable checks
- Set wrenApiKey to dummy value 'server-proxy'
- Add comments explaining API key is server-side only
- Remove error logging for missing client-side key

This fixes the console error: "Missing required environment variable: NEXT_PUBLIC_WREN_API_TOKEN"

src/utils/config.ts

@@ -1,38 +1,21 @@
 interface Config {
-  wrenApiKey: string;
+  wrenApiKey: string; // Legacy field - now handled by server-side proxy routes
   isProduction: boolean;
 }
 
-// Load environment variables - Next.js requires direct static references
-// First try window.env (for Docker), then fall back to process.env (for development)
-const getWrenApiKey = (): string => {
-  // Check window.env for Docker deployment
-  if (typeof window !== 'undefined' && (window as any).env?.WREN_API_TOKEN) {
-    return (window as any).env.WREN_API_TOKEN;
-  }
-
-  // Fall back to Next.js environment variable (must be direct reference for client-side)
-  return process.env.NEXT_PUBLIC_WREN_API_TOKEN || '';
-};
-
-const wrenApiKey = getWrenApiKey();
-
 // Initialize config
+// NOTE: Wren API key is no longer needed client-side
+// All Wren API calls go through server-side proxy routes at /api/wren/*
+// which securely handle the API token on the server
 export const config: Config = {
-  wrenApiKey: wrenApiKey || '',
+  wrenApiKey: 'server-proxy', // Dummy value - actual key is server-side only
   isProduction: process.env.NODE_ENV === 'production'
 };
 
-// Validate required environment variables
-if (!config.wrenApiKey) {
-  console.error('Missing required environment variable: NEXT_PUBLIC_WREN_API_TOKEN');
-  console.error('Current environment:', typeof window !== 'undefined' && (window as any)?.env ? JSON.stringify((window as any).env) : 'No window.env available');
-}
-
 // Log config in development
 if (!config.isProduction) {
   console.log('Config:', {
-    ...config,
-    wrenApiKey: config.wrenApiKey ? '[REDACTED]' : 'MISSING'
+    isProduction: config.isProduction,
+    wrenApiKey: '[SERVER-SIDE PROXY]'
   });
 }