Fix: model type error. (#9308)

### What problem does this PR solve?

#9240

### Type of change

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

agent/tools/retrieval.py

                 kb_ids.append(id)
                 continue
             kb_nm = self._canvas.get_variable_value(id)
-            e, kb = KnowledgebaseService.get_by_name(kb_nm)
+            e, kb = KnowledgebaseService.get_by_name(kb_nm, self._canvas._tenant_id)
             if not e:
                 raise Exception(f"Dataset({kb_nm}) does not exist.")
             kb_ids.append(kb.id)

api/db/services/llm_service.py

                 if llm_id == llm["llm_name"]:
                     return llm["model_type"].split(",")[-1]
 
+        for llm in TenantLLMService.query(llm_name=llm_id):
+            return llm.model_type
+
         for llm in LLMService.query(llm_name=llm_id):
             return llm.model_type