feat: recreate Server Agent for premium VM management

Session-based agent with OpenAI Function Calling (9 tools).
Follows ddos-agent pattern: execute tools inside loop, feed results back to AI.
Includes D1 migration, session routing in openai-service, and doc updates.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/openai-service.ts

@@ -10,6 +10,7 @@ import { processTroubleshootConsultation, hasTroubleshootSession } from './agent
 import { processDomainConsultation, hasDomainSession } from './agents/domain-agent';
 import { processDepositConsultation, hasDepositSession } from './agents/deposit-agent';
 import { processDdosConsultation, hasDdosSession } from './agents/ddos-agent';
+import { processServerConsultation, hasServerSession } from './agents/server-agent';
 
 const logger = createLogger('openai');
 
@@ -296,6 +297,29 @@ export async function generateOpenAIResponse(
       });
       // Continue with normal flow if session check fails
     }
+
+    // Check for active server management session
+    try {
+      const hasServerSess = await hasServerSession(env.DB, telegramUserId);
+
+      if (hasServerSess) {
+        logger.info('서버 관리 세션 감지, Server 에이전트로 라우팅', {
+          userId: telegramUserId
+        });
+        const serverResponse = await processServerConsultation(env.DB, telegramUserId, userMessage, env);
+
+        // PASSTHROUGH: 무관한 메시지는 일반 처리로 전환
+        if (serverResponse !== '__PASSTHROUGH__') {
+          return serverResponse;
+        }
+        // Continue to normal flow below
+      }
+    } catch (error) {
+      logger.error('Server session check failed, continuing with normal flow', error as Error, {
+        telegramUserId
+      });
+      // Continue with normal flow if session check fails
+    }
   }
 
   if (!env.OPENAI_API_KEY) {