feat: able to configure ratio for different models (close #26)

common/constants.go

@@ -48,7 +48,11 @@ var TurnstileSiteKey = ""
 var TurnstileSecretKey = ""
 
 var QuotaForNewUser = 100
-var BytesNumber2Quota = 0.8
+
+// https://platform.openai.com/docs/models/model-endpoint-compatibility
+var RatioGPT3dot5 float64 = 2
+var RatioGPT4 float64 = 30
+var RatioGPT4_32k float64 = 60
 
 const (
 	RoleGuestUser  = 0