fix: add support for gpt-5.4 model in model_ratio.go

setting/ratio_setting/model_ratio.go

@@ -471,6 +471,9 @@ func getHardcodedCompletionModelRatio(name string) (float64, bool) {
 		}
 		// gpt-5 匹配
 		if strings.HasPrefix(name, "gpt-5") {
+			if strings.HasPrefix(name, "gpt-5.4") {
+				return 6, true
+			}
 			return 8, true
 		}
 		// gpt-4.5-preview匹配