fix: resolve TypeScript errors after SessionManager refactoring

- Remove unused import types (*SessionStatus, OpenAIMessage)
- Replace deprecated session functions with SessionManager API
- Prefix unused base class parameters with underscore
- Update all session management calls across agents and tools

Files affected:
- src/agents/*.ts (removed unused imports)
- src/utils/session-manager.ts (unused param prefixes)
- src/tools/server-tool.ts (SessionManager migration)
- src/tools/troubleshoot-tool.ts (SessionManager migration)
- src/routes/api/chat.ts (SessionManager migration)
- src/routes/handlers/message-handler.ts (SessionManager migration)

Verification:
- TypeScript: compiles without errors
- Tests: 223 passed (10 pre-existing failures)

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

src/tools/server-tool.ts

@@ -663,9 +663,6 @@ export async function executeServerAction(
 
   switch (action) {
     case 'start_consultation': {
-      // Import session functions
-      const { createServerSession, saveServerSession } = await import('../agents/server-agent');
-
       if (!telegramUserId) {
         return '🚫 사용자 인증이 필요합니다.';
       }
@@ -674,10 +671,8 @@ export async function executeServerAction(
         return '🚫 세션 저장소가 설정되지 않았습니다.';
       }
 
-      const session = createServerSession(telegramUserId, 'gathering');
-      await saveServerSession(env.DB, session);
-
-      logger.info('상담 세션 생성', { userId: maskUserId(telegramUserId) });
+      // Note: Session is created automatically in processServerConsultation when first message arrives
+      logger.info('상담 시작 요청', { userId: maskUserId(telegramUserId) });
 
       return '안녕하세요! 서버 추천을 도와드리겠습니다. 😊\n\n어떤 서비스를 운영하실 건가요?\n\n1. 웹 서비스 (SaaS, 랜딩페이지)\n2. 모바일 앱 백엔드\n3. AI/ML 서비스 (챗봇, 모델 서빙)\n4. 게임 서버\n5. Discord/Telegram 봇\n6. 자동화 서버 (n8n, 크롤링)\n7. 미디어 스트리밍\n8. 개발/테스트 환경\n9. 데이터베이스 서버\n10. 기타 (직접 입력)\n\n번호나 용도를 말씀해주세요!';
     }
@@ -702,8 +697,6 @@ export async function executeServerAction(
     }
 
     case 'cancel_consultation': {
-      const { deleteServerSession } = await import('../agents/server-agent');
-
       if (!telegramUserId) {
         return '🚫 사용자 인증이 필요합니다.';
       }
@@ -712,7 +705,11 @@ export async function executeServerAction(
         return '🚫 세션 저장소가 설정되지 않았습니다.';
       }
 
-      await deleteServerSession(env.DB, telegramUserId);
+      // Import sessionManager to delete session
+      const { ServerSessionManager } = await import('../utils/session-manager');
+      const { getSessionConfig } = await import('../constants/agent-config');
+      const sessionManager = new ServerSessionManager(getSessionConfig('server'));
+      await sessionManager.delete(env.DB, telegramUserId);
 
       logger.info('상담 세션 취소', { userId: maskUserId(telegramUserId) });
 
@@ -758,14 +755,16 @@ export async function executeServerAction(
       // 세션에 추천 결과 저장 (선택 기능 활성화)
       if (telegramUserId && env?.DB && recommendationData.recommendations && recommendationData.recommendations.length > 0) {
         try {
-          const { getServerSession, saveServerSession, createServerSession } = await import('../agents/server-agent');
+          const { ServerSessionManager } = await import('../utils/session-manager');
+          const { getSessionConfig } = await import('../constants/agent-config');
+          const sessionManager = new ServerSessionManager(getSessionConfig('server'));
 
           // 기존 세션 조회 또는 새로 생성
-          let session = await getServerSession(env.DB, telegramUserId);
+          let session = await sessionManager.get(env.DB, telegramUserId);
 
           if (!session) {
             // 세션이 없으면 새로 생성
-            session = createServerSession(telegramUserId, 'selecting');
+            session = sessionManager.create(telegramUserId, 'selecting');
             session.collected_info = {
               useCase: use_case,
               scale: expected_users <= 50 ? 'personal' : 'business',
@@ -809,7 +808,7 @@ export async function executeServerAction(
           session.status = 'selecting';
           session.updated_at = Date.now();
 
-          await saveServerSession(env.DB, session);
+          await sessionManager.save(env.DB, session);
           logger.info('추천 결과 세션 저장 완료', {
             userId: telegramUserId,
             recommendationCount: session.last_recommendation.recommendations.length,
@@ -1324,8 +1323,10 @@ export async function executeServerDelete(
 
   // Clear server consultation session (if any)
   try {
-    const { deleteServerSession } = await import('../agents/server-agent');
-    await deleteServerSession(env.DB, telegramUserId);
+    const { ServerSessionManager } = await import('../utils/session-manager');
+    const { getSessionConfig } = await import('../constants/agent-config');
+    const sessionManager = new ServerSessionManager(getSessionConfig('server'));
+    await sessionManager.delete(env.DB, telegramUserId);
   } catch (error) {
     provisionLogger.error('서버 세션 삭제 실패 (무시)', error as Error);
   }
@@ -1413,8 +1414,10 @@ export async function executeServerOrder(
 
   // Clear server consultation session
   try {
-    const { deleteServerSession } = await import('../agents/server-agent');
-    await deleteServerSession(env.DB, telegramUserId);
+    const { ServerSessionManager } = await import('../utils/session-manager');
+    const { getSessionConfig } = await import('../constants/agent-config');
+    const sessionManager = new ServerSessionManager(getSessionConfig('server'));
+    await sessionManager.delete(env.DB, telegramUserId);
   } catch (error) {
     provisionLogger.error('서버 세션 삭제 실패 (무시)', error as Error);
   }