refactor(utils): Extract utilities from server.js

- Create src/utils/http.js - fetchT and HTTP helpers
- Create src/utils/logging.js - Structured logging and error logging
- Create src/utils/responses.js - Standard API responses
- Create src/utils/async-handler.js - Async wrapper with error handling
- Create src/utils/index.js - Consolidated exports

Removes scattered helper functions from server.js

dashcaddy-api/src/utils/index.js

@@ -0,0 +1,25 @@
+/**
+ * Utilities index - Re-export all utility modules
+ */
+const { fetchT } = require('./http');
+const { LOG_LEVELS, createLogger, logError, safeErrorMessage } = require('./logging');
+const { errorResponse, ok } = require('./responses');
+const { asyncHandler } = require('./async-handler');
+
+module.exports = {
+  // HTTP
+  fetchT,
+  
+  // Logging
+  LOG_LEVELS,
+  createLogger,
+  logError,
+  safeErrorMessage,
+  
+  // Responses
+  errorResponse,
+  ok,
+  
+  // Async handling
+  asyncHandler,
+};