feat: add secure login page with jwt authentication and button animation

.env.example

@@ -10,10 +10,15 @@ POSTGRES_USER=graphuser
 POSTGRES_PASSWORD=super_secret_password_here
 POSTGRES_DB=graphdb
 
-# --- Backend Configuration ---
+# --- Application Security ---
 # The API key used by n8n to authenticate with the backend
 API_KEY=nexstar_secret_key_123
 
+# --- Dashboard Login Credentials ---
+ADMIN_EMAIL=admin@admin.com
+ADMIN_PASSWORD=admin123
+JWT_SECRET=super_secret_jwt_key_123
+
 # --- Frontend Configuration (Optional) ---
 # If you need to override the API URL for the frontend
 # VITE_API_URL=/api