Add enhanced logging for demo session tenant queries

Added detailed logging to help diagnose empty tenant list issues:
- Log demo_session_id, demo_account_type, and tenant_count
- Log actual tenant IDs returned
- Log when demo user detected but no session ID

This will help identify:
1. If demo_session_id is being passed correctly from gateway
2. If tenants exist in DB for the session
3. Timing issues (API called before session fully initialized)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

services/tenant/app/api/tenants.py

@@ -182,14 +182,25 @@ async def get_user_tenants(
             demo_session_id = current_user.get("demo_session_id")
             demo_account_type = current_user.get("demo_account_type", "professional")
 
+            logger.info(
+                "Demo session detected for get_user_tenants",
+                user_id=user_id,
+                actual_user_id=actual_user_id,
+                demo_session_id=demo_session_id,
+                demo_account_type=demo_account_type,
+                has_session_id=bool(demo_session_id)
+            )
+
             if demo_session_id:
                 # Get only tenants for this specific demo session
                 tenants = await tenant_service.get_virtual_tenants_for_session(demo_session_id, demo_account_type)
-                logger.debug(
+                logger.info(
                     "Get demo session tenants successful",
                     user_id=user_id,
                     demo_session_id=demo_session_id,
-                    tenant_count=len(tenants)
+                    demo_account_type=demo_account_type,
+                    tenant_count=len(tenants),
+                    tenant_ids=[str(t.id) for t in tenants] if tenants else []
                 )
                 return tenants
             else: