Add API_INTERNAL_URL to frontend deployment for K8s

The Next.js rewrites were falling back to localhost:5001 because
API_INTERNAL_URL was not set. This caused API proxy errors.

- Added API_INTERNAL_URL=http://workclub-api:8080
- This allows Next.js to proxy /api/* calls to the internal backend service

frontend/src/auth/auth.ts

@@ -96,6 +96,12 @@ export const { handlers, signIn, signOut, auth } = NextAuth({
         session.user.isAdmin = token.isAdmin as boolean | undefined
       }
       session.accessToken = token.accessToken as string | undefined
+      
+      // Log session data for debugging
+      console.log('[Session Debug] Session user:', session.user);
+      console.log('[Session Debug] Token isAdmin:', token.isAdmin);
+      console.log('[Session Debug] Session isAdmin:', session.user?.isAdmin);
+      
       return session
     }
   }

infra/k8s/base/frontend-deployment.yaml

@@ -50,6 +50,8 @@ spec:
         env:
         - name: NODE_ENV
           value: "production"
+        - name: API_INTERNAL_URL
+          value: "http://workclub-api:8080"
         - name: NEXT_PUBLIC_API_URL
           valueFrom:
             configMapKeyRef: