refactor: 移除 relay 服务中的 model 参数，Dify /chat-messages 不需要此字段

README.md

@@ -35,7 +35,7 @@ curl http://localhost:8000/health
 curl -X POST http://localhost:8000/v1/chat/completions \
   -H "Content-Type: application/json" \
   -d '{
-    "model": "your-model",
+    "model": "dify",
     "messages": [{"role": "user", "content": "你好"}]
   }'
 ```

digital-human.py

@@ -136,7 +136,7 @@ async def health_check():
 # ──────────────────────────────────────────────────────────────
 # Dify 响应格式转 OpenAI 兼容格式
 # ──────────────────────────────────────────────────────────────
-def dify_to_openai(dify_resp: Dict[str, Any], model: str = "dify") -> Dict[str, Any]:
+def dify_to_openai(dify_resp: Dict[str, Any]) -> Dict[str, Any]:
     """
     将 Dify /chat-messages 的响应转换为 OpenAI /chat/completions 兼容格式。
     Dify 响应示例: { answer: "...", conversation_id: "...", task_id: "..." }
@@ -146,7 +146,7 @@ def dify_to_openai(dify_resp: Dict[str, Any], model: str = "dify") -> Dict[str,
         "id": f"chatcmpl-{dify_resp.get('task_id', 'unknown')}",
         "object": "chat.completion",
         "created": 0,
-        "model": model,
+        "model": "dify",
         "choices": [
             {
                 "index": 0,
@@ -210,7 +210,7 @@ async def chat_completions(request: Request):
         cached = get_redis().get(cache_key)
         if cached:
             logger.info(f"缓存命中: {cache_key}")
-            return dify_to_openai(json.loads(cached), model=body.get("model", "dify"))
+            return dify_to_openai(json.loads(cached))
     except RedisConnectionError:
         logger.warning("Redis 不可用，跳过缓存读取")
 
@@ -243,7 +243,7 @@ async def chat_completions(request: Request):
         pass
 
     # ── 响应转 OpenAI 兼容格式 ─────────────────────────────────
-    return dify_to_openai(result, model=body.get("model", "dify"))
+    return dify_to_openai(result)
 
 
 # ──────────────────────────────────────────────────────────────

test.html

@@ -194,9 +194,6 @@
     .success-text { color: #86efac; }
     .warn-text { color: #fcd34d; }
 
-    /* Model select */
-    #model { margin-bottom: 20px; }
-
     /* Streaming indicator */
     .streaming-indicator {
       display: none;
@@ -256,10 +253,6 @@
         <label>Dify API 密钥</label>
         <input type="password" id="apiKey" placeholder="app-xxxxxxxx" />
       </div>
-      <div class="field">
-        <label>模型名称</label>
-        <input type="text" id="modelName" placeholder="dify" />
-      </div>
     </div>
 
     <div class="btn-row">
@@ -286,7 +279,6 @@
   // ── Helpers ────────────────────────────────────────────────
   const relayUrl = () => document.getElementById('relayUrl').value.replace(/\/$/, '');
   const apiKey   = () => document.getElementById('apiKey').value.trim();
-  const model    = () => document.getElementById('modelName').value.trim() || 'dify';
 
   function setStatus(type, text) {
     const dot  = document.getElementById('statusDot');
@@ -354,7 +346,6 @@
     setStatus('idle', '请求中…');
 
     const payload = {
-      model: model(),
       stream: false,
       messages: [
         { role: 'user', content: '你好，请用一句话介绍自己。' }