Add temperature override option in config

- Add temperature field to Config struct (optional override)\n- Pass tempOverride to ConvertOpenAIRequest\n- Use override temperature if set, otherwise use client's temperature\n- Document option in config.yaml with example\n- Update README with temperature override documentation

handler.go

@@ -12,15 +12,16 @@ import (
 )
 
 type ModelConfig struct {
-	ID       string `yaml:"id"`
-	OwnedBy  string `yaml:"owned_by"`
+	ID      string `yaml:"id"`
+	OwnedBy string `yaml:"owned_by"`
 }
 
 // Config holds the application configuration
 type Config struct {
-	Port        int            `yaml:"port"`
-	UpstreamURL string         `yaml:"upstream_url"`
-	Models      []ModelConfig   `yaml:"models"`
+	Port        int          `yaml:"port"`
+	UpstreamURL string       `yaml:"upstream_url"`
+	Models      []ModelConfig `yaml:"models"`
+	Temperature *float64     `yaml:"temperature,omitempty"`
 }
 
 var config *Config
@@ -124,7 +125,7 @@ func handleChatCompletions(w http.ResponseWriter, r *http.Request) {
 
 	// Convert to Anthropic format — always non-streaming to upstream
 	// (ZAI's streaming returns empty for GLM models)
-	anthropicReq := ConvertOpenAIRequest(&req)
+	anthropicReq := ConvertOpenAIRequest(&req, config.Temperature)
 	anthropicReq.Stream = false
 
 	reqBody, _ := json.Marshal(anthropicReq)