fix: resolve retired/preview gemini model routing and test configuration errors

internal/providers/moonshot.go

@@ -44,6 +44,11 @@ func (p *MoonshotProvider) ChatCompletion(ctx context.Context, req *models.Unifi
 			body["max_completion_tokens"] = maxTokens
 		}
 	}
+	if strings.Contains(strings.ToLower(req.Model), "kimi-k2.6") {
+		if _, ok := body["temperature"]; ok {
+			body["temperature"] = 1.0
+		}
+	}
 
 	baseURL := strings.TrimRight(p.config.BaseURL, "/")
 
@@ -90,6 +95,11 @@ func (p *MoonshotProvider) ChatCompletionStream(ctx context.Context, req *models
 			body["max_completion_tokens"] = maxTokens
 		}
 	}
+	if strings.Contains(strings.ToLower(req.Model), "kimi-k2.6") {
+		if _, ok := body["temperature"]; ok {
+			body["temperature"] = 1.0
+		}
+	}
 
 	baseURL := strings.TrimRight(p.config.BaseURL, "/")