Fix: Tried to fix the fid mis match under some cases (#7426)

### What problem does this PR solve?

https://github.com/infiniflow/ragflow/issues/7407

Based on this context, I think there should be some reasons that let
some LLMs have a mismatch (add the wrong "@xxx"),
So I think when use fid can not fetch llm then tried to just use name
should can fetch it.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

api/db/services/llm_service.py

 
         model_config = cls.get_api_key(tenant_id, mdlnm)
         mdlnm, fid = TenantLLMService.split_model_name_and_factory(mdlnm)
+        if not model_config:  # for some cases seems fid mismatch
+            model_config = cls.get_api_key(tenant_id, mdlnm)
         if model_config:
             model_config = model_config.to_dict()
             llm = LLMService.query(llm_name=mdlnm) if not fid else LLMService.query(llm_name=mdlnm, fid=fid)
+            if not llm and fid: # for some cases seems fid mismatch
+                llm = LLMService.query(llm_name=mdlnm)
             if llm:
                 model_config["is_tools"] = llm[0].is_tools
         if not model_config: