feat: add system prompt override functionality in channel settings and request handling #1468

dto/channel_settings.go

@@ -6,4 +6,5 @@ type ChannelSettings struct {
 	Proxy                  string `json:"proxy"`
 	PassThroughBodyEnabled bool   `json:"pass_through_body_enabled,omitempty"`
 	SystemPrompt           string `json:"system_prompt,omitempty"`
+	SystemPromptOverride   bool   `json:"system_prompt_override,omitempty"`
 }

dto/openai_request.go

@@ -78,6 +78,8 @@ func (r *GeneralOpenAIRequest) GetSystemRoleName() string {
 		if !strings.HasPrefix(r.Model, "o1-mini") && !strings.HasPrefix(r.Model, "o1-preview") {
 			return "developer"
 		}
+	} else if strings.HasPrefix(r.Model, "gpt-5") {
+		return "developer"
 	}
 	return "system"
 }