feat(tenant/kol): let KOLs self-subscribe to their own published packages

Add /kol/manage/packages/:id/self-subscription POST/DELETE on the tenant
side so a KOL can grant themselves access to their own published package
without going through the marketplace approval flow. Reject self-subscribe
through the marketplace with a clear error, expose owned_by_current_tenant
on package responses, and surface a self_subscription block on KolPackage
Response. The admin-web KOL workspace gets 订阅自己 / 取消订阅 entries with
matching messaging in the marketplace detail view.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/internal/tenant/transport/kol_manage_handler.go

@@ -40,7 +40,7 @@ func NewKolManageHandler(a *bootstrap.App, assets *AssetHandler) *KolManageHandl
 
 	return &KolManageHandler{
 		profileSvc: profileSvc,
-		pkgSvc:     app.NewKolPackageService(profileSvc, a.KolPackages, a.KolPrompts).WithCache(a.Cache),
+		pkgSvc:     app.NewKolPackageService(profileSvc, a.KolPackages, a.KolPrompts, a.KolSubscriptions).WithCache(a.Cache),
 		promptSvc:  app.NewKolPromptService(a.DB, profileSvc, a.KolPackages, a.KolPrompts, a.KolSubscriptions, a.KolPromptAsset).WithCache(a.Cache),
 		assistSvc:  app.NewKolAssistService(a.DB, profileSvc, a.KolAssists, a.LLM, a.RabbitMQ, a.Config.LLM, a.Logger).WithCache(a.Cache),
 		assets:     assets,
@@ -249,6 +249,46 @@ func (h *KolManageHandler) ArchivePackage(c *gin.Context) {
 	response.Success(c, data)
 }
 
+func (h *KolManageHandler) SelfSubscribePackage(c *gin.Context) {
+	id, ok := parseInt64Param(c, "id", "package id")
+	if !ok {
+		return
+	}
+
+	actor, ok := actorFromRequest(c)
+	if !ok {
+		return
+	}
+
+	data, err := h.pkgSvc.SelfSubscribe(c.Request.Context(), actor, id)
+	if err != nil {
+		response.Error(c, err)
+		return
+	}
+
+	response.Success(c, data)
+}
+
+func (h *KolManageHandler) CancelSelfSubscription(c *gin.Context) {
+	id, ok := parseInt64Param(c, "id", "package id")
+	if !ok {
+		return
+	}
+
+	actor, ok := actorFromRequest(c)
+	if !ok {
+		return
+	}
+
+	data, err := h.pkgSvc.CancelSelfSubscription(c.Request.Context(), actor, id)
+	if err != nil {
+		response.Error(c, err)
+		return
+	}
+
+	response.Success(c, data)
+}
+
 func (h *KolManageHandler) ListPrompts(c *gin.Context) {
 	packageID, ok := parseInt64Param(c, "id", "package id")
 	if !ok {