Phase 1: Add ESLint/Prettier config + baseline auto-fixes

dashcaddy-api/__tests__/input-validator.test.js

@@ -9,7 +9,7 @@ const {
   validateServiceConfig,
   sanitizeString,
   isValidPort,
-  isPrivateIP
+  isPrivateIP,
 } = require('../input-validator');
 
 // Helper: extract .errors from ValidationError