feat(risk-control): add content moderation audit

backend/internal/service/settings_view.go

@@ -106,6 +106,7 @@ type SystemSettings struct {
 
 	DefaultConcurrency           int
 	DefaultBalance               float64
+	RiskControlEnabled           bool
 	AffiliateEnabled             bool
 	AffiliateRebateRate          float64
 	AffiliateRebateFreezeHours   int
@@ -233,6 +234,9 @@ type PublicSettings struct {
 
 	// Affiliate (邀请返利) feature toggle
 	AffiliateEnabled bool `json:"affiliate_enabled"`
+
+	// 风控中心功能开关
+	RiskControlEnabled bool `json:"risk_control_enabled"`
 }
 
 type WeChatConnectOAuthConfig struct {