feat(features): 功能开放 - 增加自定义渠道开关

backend/internal/handler/channel_models.go

@@ -17,6 +17,10 @@ func RegisterChannelModelRoutes(r *gin.RouterGroup, svc *service.Service) {
 			failService(c, err)
 			return
 		}
+		if err := svc.RequireFeature(service.FeatureCustomChannels); err != nil {
+			failService(c, err)
+			return
+		}
 		if !enforceRateLimit(c, "channel-models:"+user.ID, 30, time.Minute) {
 			return
 		}

backend/internal/handler/custom_proxy.go

@@ -27,6 +27,10 @@ func RegisterCustomRelayRoutes(r *gin.RouterGroup, svc *service.Service) {
 			failService(c, err)
 			return
 		}
+		if err := svc.RequireFeature(service.FeatureCustomChannels); err != nil {
+			failService(c, err)
+			return
+		}
 		policy, available := loadRuntimePolicy(c, svc)
 		if !available || !enforceRateLimit(c, "custom-relay:"+user.ID, policy.Request.CustomRelayPerMinute, time.Minute) {
 			return

backend/internal/handler/feature_availability.go

@@ -42,8 +42,13 @@ func RegisterFeatureAvailabilityRoutes(r *gin.RouterGroup, svc *service.Service)
 			failService(c, err)
 			return
 		}
+		current, err := svc.AdminFeatureAvailability(user)
+		if err != nil {
+			failService(c, err)
+			return
+		}
 		c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, 16<<10)
-		var req service.FeatureAvailability
+		req := current.FeatureAvailability
 		if err := c.ShouldBindJSON(&req); err != nil {
 			fail(c, http.StatusBadRequest, err)
 			return