Update CORS allowed origins and configure backend URL from environment variable

Author: Warren-SJ

backend/src/main/resources/application.yml

@@ -19,4 +19,4 @@ app:
     script: ./AI/analyze.py
 
 cors:
-  allowed-origins: "http://localhost:3000"
+  allowed-origins: "http://localhost:3000, https://apex-grid-transformer-tracker.vercel.app"

frontend/lib/api.ts

@@ -1,5 +1,5 @@
 // Prefer env, fallback to local; ensure protocol is present.
-const raw = ("http://localhost:8080").trim().replace(/\/$/, "");
+const raw = (process.env.NEXT_PUBLIC_BACKEND_URL || "http://localhost:8080").trim().replace(/\/$/, "");
 export const API_BASE = raw.startsWith("http://") || raw.startsWith("https://") ? raw : `http://${raw}`;
 
 export const apiUrl = (path: string) => `${API_BASE}${path.startsWith('/') ? '' : '/'}${path}`;