Add MaxImageResolution config setting (#17941)

model/utils.go

@@ -31,7 +31,6 @@ const (
 	UppercaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 	NUMBERS          = "0123456789"
 	SYMBOLS          = " !\"\\#$%&'()*+,-./:;<=>?@[]^_`|~"
-	MB               = 1 << 20
 )
 
 type StringInterface map[string]interface{}