fix mcp and admin api

.env.example

@@ -60,6 +60,13 @@ ADMIN_USER=
 ADMIN_PASSWORD=
 SESSION_SECRET=
 
+# External Admin API Key
+# Generate a secure key: openssl rand -hex 32
+# Format: sk_live_<your-secure-key> for production, sk_test_<your-secure-key> for testing
+ADMIN_API_KEY=
+ADMIN_API_JWT_TTL=3600
+ADMIN_API_RATE_LIMIT=1000
+
 # Database Configuration (Phase 1.2 & 1.3)
 # Set USE_JSON_DATABASE=1 to use legacy JSON files (for rollback)
 USE_JSON_DATABASE=