feat: add reasoning effort configuration for models

- Support setting reasoning effort via model name suffix
- Add `-high`, `-medium`, and `-low` suffixes to control reasoning effort
- Update README with new model configuration option
- Modify OpenAI adaptor to handle reasoning effort settings

relay/channel/openai/adaptor.go

@@ -117,6 +117,13 @@ func (a *Adaptor) ConvertRequest(c *gin.Context, info *relaycommon.RelayInfo, re
 		if strings.HasPrefix(request.Model, "o3") {
 			request.Temperature = nil
 		}
+		if strings.HasSuffix(request.Model, "high") {
+			request.ReasoningEffort = "high"
+		} else if strings.HasSuffix(request.Model, "low") {
+			request.ReasoningEffort = "low"
+		} else if strings.HasSuffix(request.Model, "medium") {
+			request.ReasoningEffort = "medium"
+		}
 	}
 	if request.Model == "o1" || request.Model == "o1-2024-12-17" || strings.HasPrefix(request.Model, "o3") {
 		//修改第一个Message的内容，将system改为developer

relay/channel/openai/constant.go

@@ -14,6 +14,9 @@ var ModelList = []string{
 	"o1-preview", "o1-preview-2024-09-12",
 	"o1-mini", "o1-mini-2024-09-12",
 	"o3-mini", "o3-mini-2025-01-31",
+	"o3-mini-high", "o3-mini-2025-01-31-high",
+	"o3-mini-low", "o3-mini-2025-01-31-low",
+	"o3-mini-medium", "o3-mini-2025-01-31-medium",
 	"o1", "o1-2024-12-17",
 	"gpt-4o-audio-preview", "gpt-4o-audio-preview-2024-10-01",
 	"gpt-4o-realtime-preview", "gpt-4o-realtime-preview-2024-10-01", "gpt-4o-realtime-preview-2024-12-17",