refactor: migrate naming convention detector to AST-based analysis

packages/guardian/src/domain/services/INamingConventionDetector.ts

@@ -7,12 +7,14 @@ export interface INamingConventionDetector {
     /**
      * Detects naming convention violations for a given file
      *
+     * @param content - Source code content to analyze
      * @param fileName - Name of the file to check (e.g., "UserService.ts")
      * @param layer - Architectural layer of the file (domain, application, infrastructure, shared)
      * @param filePath - Relative file path for context
      * @returns Array of naming convention violations
      */
     detectViolations(
+        content: string,
         fileName: string,
         layer: string | undefined,
         filePath: string,