fix: suppress TypeScript unused variable error in AutoConnectService

Add @ts-expect-error comment to _configManager variable which is
preserved for future use when config options are added.

Type check: 0 errors

Author: claude

src/services/AutoConnectService.ts

@@ -22,6 +22,7 @@ import { SavedPrinterMatch, AutoConnectDecision } from '../types/printer';
 export class AutoConnectService extends EventEmitter {
   private static instance: AutoConnectService | null = null;
   // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  // @ts-expect-error - ConfigManager will be used when config options are added
   private readonly _configManager = getConfigManager();
 
   private constructor() {