debug(cloudflare): add detailed logging for tunnel creation failures

apps/api/src/api/tool_instances.py

@@ -440,10 +440,14 @@ async def start_instance(
             tunnel_info["public_url"],
         )
     except Exception as exc:
-        logger.exception(
-            "Failed to create tunnel for instance %s: %s. Falling back to proxy URL.",
+        import traceback
+        error_msg = str(exc)
+        error_trace = traceback.format_exc()
+        logger.error(
+            "Failed to create tunnel for instance %s: %s\nTraceback:\n%s",
             instance.id,
-            exc,
+            error_msg,
+            error_trace,
         )
         instance.url = f"/instances/{instance.id}/proxy/"
         await session.commit()

apps/api/src/services/cloudflare_tunnel.py

@@ -43,13 +43,17 @@ async def create_tunnel(
     if settings is None:
         settings = Settings()
 
+    logger.info("Settings loaded: api_token=%s, account_id=%s, zone_id=%s, base_domain=%s",
+                "set" if settings.cloudflare_api_token else "NOT SET",
+                settings.cloudflare_account_id or "NOT SET",
+                settings.cloudflare_zone_id or "NOT SET",
+                settings.cloudflare_base_domain or "NOT SET")
+
     if not settings.cloudflare_api_token:
         raise ValueError("CLOUDFLARE_API_TOKEN not configured")
 
     logger.info("Creating Cloudflare tunnel for instance_name=%s, instance_id=%s, port=%d", 
                 instance_name, instance_id, instance_port)
-    logger.info("Cloudflare config: account_id=%s, zone_id=%s, base_domain=%s",
-                settings.cloudflare_account_id, settings.cloudflare_zone_id, settings.cloudflare_base_domain)
 
     headers = _get_headers(settings)
     account_id = settings.cloudflare_account_id