fix(deepseek): add more exhaustive sanitation for deepseek-reasoner

R1 model does not support presence_penalty, frequency_penalty, logit_bias,
logprobs, or top_logprobs. Added these to the list of stripped parameters.

src/providers/deepseek.rs

@@ -57,7 +57,22 @@ impl super::Provider for DeepSeekProvider {
 
     async fn chat_completion(&self, request: UnifiedRequest) -> Result<ProviderResponse, AppError> {
         let messages_json = helpers::messages_to_openai_json(&request.messages).await?;
-        let body = helpers::build_openai_body(&request, messages_json, false);
+        let mut body = helpers::build_openai_body(&request, messages_json, false);
+
+        // Sanitize for deepseek-reasoner
+        if request.model == "deepseek-reasoner" {
+            if let Some(obj) = body.as_object_mut() {
+                obj.remove("tools");
+                obj.remove("tool_choice");
+                obj.remove("temperature");
+                obj.remove("top_p");
+                obj.remove("presence_penalty");
+                obj.remove("frequency_penalty");
+                obj.remove("logit_bias");
+                obj.remove("logprobs");
+                obj.remove("top_logprobs");
+            }
+        }
 
         let response = self
             .client
@@ -114,7 +129,28 @@ impl super::Provider for DeepSeekProvider {
         // DeepSeek doesn't support images in streaming, use text-only
         let messages_json = helpers::messages_to_openai_json_text_only(&request.messages).await?;
         let mut body = helpers::build_openai_body(&request, messages_json, true);
-        body.as_object_mut().expect("body is object").remove("stream_options");
+
+        // DeepSeek reasoning model doesn't support stream_options
+        if request.model == "deepseek-reasoner" {
+            if let Some(obj) = body.as_object_mut() {
+                obj.remove("stream_options");
+                // Also does not support these parameters
+                obj.remove("tools");
+                obj.remove("tool_choice");
+                obj.remove("temperature");
+                obj.remove("top_p");
+                obj.remove("presence_penalty");
+                obj.remove("frequency_penalty");
+                obj.remove("logit_bias");
+                obj.remove("logprobs");
+                obj.remove("top_logprobs");
+            }
+        } else {
+            // For standard deepseek-chat, keep it clean
+            if let Some(obj) = body.as_object_mut() {
+                obj.remove("stream_options");
+            }
+        }
 
         let es = reqwest_eventsource::EventSource::new(
             self.client