refactor: move troubleshoot-agent to agents directory

- Move troubleshoot-agent.ts to src/agents/
- Update import paths in dependent files

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/openai-service.ts

@@ -7,7 +7,7 @@ import { metrics } from './utils/metrics';
 import { getOpenAIUrl } from './utils/api-urls';
 import { ERROR_MESSAGES } from './constants/messages';
 import { getServerSession, processServerConsultation } from './agents/server-agent';
-import { getTroubleshootSession, processTroubleshoot } from './troubleshoot-agent';
+import { getTroubleshootSession, processTroubleshoot } from './agents/troubleshoot-agent';
 import { sendMessage } from './telegram';
 
 const logger = createLogger('openai');