VolcEngine SDK V3 adaptation (#2082)

1) Configuration interface update
2) Back-end adaptation API update
Note: The official no longer supports the Skylark1/2 series, and all
have been switched to the Doubao series


![image](https://github.com/user-attachments/assets/f6fd8782-0cdf-4c0b-ac8f-9eb130f667a5)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

Co-authored-by: 海贼宅 <stu_xyx@163.com>

rag/llm/chat_model.py

@@ -450,72 +450,16 @@ class LocalLLM(Base):
 
 
 class VolcEngineChat(Base):
-    def __init__(self, key, model_name, base_url):
+    def __init__(self, key, model_name, base_url='https://ark.cn-beijing.volces.com/api/v3'):
         """
         Since do not want to modify the original database fields, and the VolcEngine authentication method is quite special,
-        Assemble ak, sk, ep_id into api_key, store it as a dictionary type, and parse it for use
+        Assemble ark_api_key, ep_id into api_key, store it as a dictionary type, and parse it for use
         model_name is for display only
         """
-        self.client = MaasService('maas-api.ml-platform-cn-beijing.volces.com', 'cn-beijing')
-        self.volc_ak = eval(key).get('volc_ak', '')
-        self.volc_sk = eval(key).get('volc_sk', '')
-        self.client.set_ak(self.volc_ak)
-        self.client.set_sk(self.volc_sk)
-        self.model_name = eval(key).get('ep_id', '')
-
-    def chat(self, system, history, gen_conf):
-        if system:
-            history.insert(0, {"role": "system", "content": system})
-        try:
-            req = {
-                "parameters": {
-                    "min_new_tokens": gen_conf.get("min_new_tokens", 1),
-                    "top_k": gen_conf.get("top_k", 0),
-                    "max_prompt_tokens": gen_conf.get("max_prompt_tokens", 30000),
-                    "temperature": gen_conf.get("temperature", 0.1),
-                    "max_new_tokens": gen_conf.get("max_tokens", 1000),
-                    "top_p": gen_conf.get("top_p", 0.3),
-                },
-                "messages": history
-            }
-            response = self.client.chat(self.model_name, req)
-            ans = response.choices[0].message.content.strip()
-            if response.choices[0].finish_reason == "length":
-                ans += "...\nFor the content length reason, it stopped, continue?" if is_english(
-                    [ans]) else "······\n由于长度的原因，回答被截断了，要继续吗？"
-            return ans, response.usage.total_tokens
-        except Exception as e:
-            return "**ERROR**: " + str(e), 0
-
-    def chat_streamly(self, system, history, gen_conf):
-        if system:
-            history.insert(0, {"role": "system", "content": system})
-        ans = ""
-        tk_count = 0
-        try:
-            req = {
-                "parameters": {
-                    "min_new_tokens": gen_conf.get("min_new_tokens", 1),
-                    "top_k": gen_conf.get("top_k", 0),
-                    "max_prompt_tokens": gen_conf.get("max_prompt_tokens", 30000),
-                    "temperature": gen_conf.get("temperature", 0.1),
-                    "max_new_tokens": gen_conf.get("max_tokens", 1000),
-                    "top_p": gen_conf.get("top_p", 0.3),
-                },
-                "messages": history
-            }
-            stream = self.client.stream_chat(self.model_name, req)
-            for resp in stream:
-                if not resp.choices[0].message.content:
-                    continue
-                ans += resp.choices[0].message.content
-                if resp.choices[0].finish_reason == "stop":
-                    tk_count = resp.usage.total_tokens
-                yield ans
-
-        except Exception as e:
-            yield ans + "\n**ERROR**: " + str(e)
-        yield tk_count
+        base_url = base_url if base_url else 'https://ark.cn-beijing.volces.com/api/v3'
+        ark_api_key = eval(key).get('ark_api_key', '')
+        model_name = eval(key).get('ep_id', '')
+        super().__init__(ark_api_key, model_name, base_url)
 
 
 class MiniMaxChat(Base):