feat: add Server Expert AI with search/docs tools for trend-aware recommendations

- Add server-agent.ts with 30-year senior architect persona
- Implement KV-based session management for multi-turn conversations
- Add search_trends (Brave Search) and lookup_framework_docs (Context7) tools
- Function Calling support with max 3 tool calls per request
- Auto-infer tech stack and expected users from use case/scale
- Prohibit competitor provider mentions (AWS, GCP, Azure, etc.)
- Simplify main AI system prompt, delegate complex logic to expert AI

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

src/openai-service.ts

@@ -93,6 +93,25 @@ export async function generateOpenAIResponse(
   telegramUserId?: string,
   db?: D1Database
 ): Promise<string> {
+  // Check if server consultation session is active
+  if (telegramUserId && env.SESSION_KV) {
+    try {
+      const { getServerSession, processServerConsultation } = await import('./server-agent');
+      const session = await getServerSession(env.SESSION_KV, telegramUserId);
+
+      if (session && session.status !== 'completed') {
+        logger.info('Active server session detected, routing to consultation', {
+          userId: telegramUserId,
+          status: session.status
+        });
+        return await processServerConsultation(userMessage, session, env);
+      }
+    } catch (error) {
+      logger.error('Session check failed, continuing with normal flow', error as Error);
+      // Continue with normal flow if session check fails
+    }
+  }
+
   if (!env.OPENAI_API_KEY) {
     throw new Error('OPENAI_API_KEY not configured');
   }