更新环境变量配置，调整模型名称获取方式，新增Dify API相关配置，删除无用的脚本文件，优化意图识别逻辑，添加LLM提取词条逻辑

rag2_0/tool/ModelTool.py

@@ -236,7 +236,7 @@ class OpenAiLLM:
             self._model = kwargs.get("model")
             kwargs.pop("model")
         else:
-            self._model = os.getenv("LLM_MODEL_NAME")
+            self._model = os.getenv("MODEL_NAME")
 
         self._kwargs = kwargs
 
@@ -284,13 +284,19 @@ class OpenAiLLM:
             except Exception as e:
                 raise RuntimeError(f"OpenAiLLM:invoke:error:{str(e)}.api_key:{api_key}") from e
 
-    async def invoke_async(self, user_prompt="你是谁？", need_retry=True):
+    async def invoke_async(self, user_prompt="你是谁？", need_retry=True, **extra_kwargs):
         """异步调用OpenAI API"""
         max_retries = 3
         retry_count = 0
-        if "timeout" not in self._kwargs:
+        
+        # 合并额外的kwargs与self._kwargs
+        kwargs = {**self._kwargs}
+        if extra_kwargs:
+            kwargs.update(extra_kwargs)
+            
+        if "timeout" not in kwargs:
             timeout = httpx.Timeout(300.0) 
-            self._kwargs["timeout"] = timeout
+            kwargs["timeout"] = timeout
 
         if need_retry:
             while retry_count < max_retries:
@@ -302,7 +308,7 @@ class OpenAiLLM:
                         completion = await client.chat.completions.create(
                             model=self._model,
                             messages=[{'role': 'user', 'content': user_prompt}],
-                            **self._kwargs
+                            **kwargs
                         )
                         return completion.choices[0].message
                     
@@ -319,7 +325,7 @@ class OpenAiLLM:
                     completion = await client.chat.completions.create(
                         model=self._model,
                         messages=[{'role': 'user', 'content': user_prompt}],
-                        **self._kwargs
+                        **kwargs
                     )
                     return completion.choices[0].message
             except Exception as e: