feat: prepare for 5.6

setting/ratio_setting/model_ratio.go

@@ -504,8 +504,8 @@ func getHardcodedCompletionModelRatio(name string) (float64, bool) {
 		}
 		// gpt-5 匹配
 		if strings.HasPrefix(name, "gpt-5") {
-			if strings.HasPrefix(name, "gpt-5.5") {
-				return 6, true
+			if !strings.Contains(name, ".") {
+				return 8, true
 			}
 			if strings.HasPrefix(name, "gpt-5.4") {
 				if strings.HasPrefix(name, "gpt-5.4-nano") {
@@ -513,7 +513,8 @@ func getHardcodedCompletionModelRatio(name string) (float64, bool) {
 				}
 				return 6, true
 			}
-			return 8, true
+			// gpt-5.5 and later models are unlocked
+			return 6, false
 		}
 		// gpt-4.5-preview匹配
 		if strings.HasPrefix(name, "gpt-4.5-preview") {