fix: Apply CodeRabbit suggestions

- Remove invalid language field from .coderabbit.yaml config
- Validate temperature before building payload (CodeRabbit suggestion)
- Improve code efficiency by validating inputs early

.coderabbit.yaml

@@ -1,7 +1,6 @@
 # CodeRabbit configuration
 # See: https://docs.coderabbit.ai/configuration
-
-language: python
+# yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json
 
 review:
   # Enable/disable review

app/routers/openai_api.py

@@ -61,22 +61,23 @@ async def chat_completions(body: ChatCompletionRequest):
                 content={"error": {"message": "messages list cannot be empty", "type": "invalid_request_error"}}
             )
         
+        # Validate temperature range before building payload
+        temperature = body.temperature or 0.7
+        if temperature < 0 or temperature > 2:
+            return JSONResponse(
+                status_code=400,
+                content={"error": {"message": "temperature must be between 0 and 2", "type": "invalid_request_error"}}
+            )
+        
         # Build payload with all supported parameters
         payload: Dict[str, Any] = {
             "model": body.model or settings.model,
             "messages": [m.model_dump() for m in body.messages],
-            "temperature": body.temperature or 0.7,
+            "temperature": temperature,
             "top_p": body.top_p or 1.0,
             "stream": body.stream or False,
         }
         
-        # Validate temperature range
-        if payload["temperature"] < 0 or payload["temperature"] > 2:
-            return JSONResponse(
-                status_code=400,
-                content={"error": {"message": "temperature must be between 0 and 2", "type": "invalid_request_error"}}
-            )
-        
         # Add optional max_tokens if provided
         if body.max_tokens is not None:
             if body.max_tokens < 1: