Complete API handlers refactoring to eliminate type switching and use repository pattern consistently

cmd/enhance.go

@@ -105,8 +105,7 @@ func runEnhance(cmd *cobra.Command, args []string) {
 		defer database.Close()
 		client = database.NewContentRepository()
 	} else {
-		fmt.Printf("🧪 No database or API configured, using mock content\n")
-		client = content.NewMockClient()
+		panic("🧪 No database or API configured\n")
 	}
 
 	// Load site-specific configuration