Add extra field tolerance to API request models for better client compatibility

- Added extra="allow" to ChatCompletionRequest and CompletionRequest
- Added common OpenAI fields: seed, logprobs, top_logprobs, response_format, user, best_of, echo
- This prevents 422 errors when clients send additional fields we don't use

Fixes compatibility issues with KiloCode and other OpenAI-compatible clients

coderai

@@ -100,6 +100,15 @@ class ChatCompletionRequest(BaseModel):
     frequency_penalty: float = 0.0
     tools: Optional[List[Tool]] = None
     tool_choice: Optional[Union[str, Dict]] = "auto"
+    # Extra fields that clients may send but we ignore
+    seed: Optional[int] = None
+    logprobs: Optional[bool] = None
+    top_logprobs: Optional[int] = None
+    response_format: Optional[Dict] = None
+    user: Optional[str] = None
+    
+    class Config:
+        extra = "allow"  # Allow extra fields to prevent 422 errors
 
 
 class CompletionRequest(BaseModel):
@@ -111,6 +120,18 @@ class CompletionRequest(BaseModel):
     max_tokens: Optional[int] = None
     stream: bool = False
     stop: Optional[Union[str, List[str]]] = None
+    presence_penalty: float = 0.0
+    frequency_penalty: float = 0.0
+    # Extra fields that clients may send but we ignore
+    seed: Optional[int] = None
+    logprobs: Optional[bool] = None
+    top_logprobs: Optional[int] = None
+    best_of: Optional[int] = None
+    echo: Optional[bool] = None
+    user: Optional[str] = None
+    
+    class Config:
+        extra = "allow"  # Allow extra fields to prevent 422 errors
 
 
 class ModelInfo(BaseModel):