fix: pass bot_type in agent mode

bridge/agent_bridge.py

@@ -97,6 +97,9 @@ class AgentLLMModel(LLMModel):
     def _resolve_bot_type(self, model_name: str) -> str:
         """Resolve bot type from model name, matching Bridge.__init__ logic."""
         from config import conf
+        configured_bot_type = conf().get("bot_type")
+        if configured_bot_type:
+            return configured_bot_type
         if conf().get("use_linkai", False) and conf().get("linkai_api_key"):
             return const.LINKAI
         if not model_name or not isinstance(model_name, str):