fix and optimize casbin (#1121)

* - 删除rabac_model.conf, 改为字符串代码, 方便部署
- 删除casbin相关配置文件

* fix: delete api时只传id导致casbin_rules表清空bug

server/config/config.go

@@ -5,7 +5,6 @@ type Server struct {
 	Zap     Zap     `mapstructure:"zap" json:"zap" yaml:"zap"`
 	Redis   Redis   `mapstructure:"redis" json:"redis" yaml:"redis"`
 	Email   Email   `mapstructure:"email" json:"email" yaml:"email"`
-	Casbin  Casbin  `mapstructure:"casbin" json:"casbin" yaml:"casbin"`
 	System  System  `mapstructure:"system" json:"system" yaml:"system"`
 	Captcha Captcha `mapstructure:"captcha" json:"captcha" yaml:"captcha"`
 	// auto