fix(auxiliary): custom provider URL rewrite + main_runtime model for title gen

- auxiliary_client: apply _to_openai_base_url() to custom base_url
  (fixes /anthropic → /v1 rewrite missing for provider="custom")
- auxiliary_client: use main_runtime.get("model") instead of _read_main_model()
  so auxiliary tasks follow system default model changes
- title_generator: thread main_runtime through generate_title → auto_title_session → maybe_auto_title
- cli.py / gateway/run.py: pass main_runtime to maybe_auto_title
- tests: update mock assertions for new main_runtime parameter

cli.py

@@ -8835,6 +8835,13 @@ class HermesCLI:
                         response,
                         self.conversation_history,
                         failure_callback=_title_failure_cb,
+                        main_runtime={
+                            "model": self.model,
+                            "provider": self.provider,
+                            "base_url": self.base_url,
+                            "api_key": self.api_key,
+                            "api_mode": self.api_mode,
+                        },
                     )
                 except Exception:
                     pass