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>

apps/admin-web/src/views/KolPackageDetailView.vue

@@ -49,6 +49,7 @@ const subscribeMutation = useMutation({
 const pkg = computed(() => packageQuery.data.value);
 const resolvedCoverUrl = computed(() => resolveApiURL(pkg.value?.cover_url));
 const subscription = computed(() => pkg.value?.subscription);
+const isOwnPackage = computed(() => Boolean(pkg.value?.owned_by_current_tenant));
 
 const subscriptionStatusMeta = computed(() => {
   if (!subscription.value) return null;
@@ -67,7 +68,7 @@ const subscriptionStatusMeta = computed(() => {
 });
 
 function handleSubscribe() {
-  if (pkg.value) {
+  if (pkg.value && !isOwnPackage.value) {
     subscribeMutation.mutate(pkg.value.id);
   }
 }
@@ -182,7 +183,11 @@ function goBack() {
         <a-col :xs="24" :lg="8">
           <a-card class="subscription-card">
             <h3 class="card-title">订阅状态</h3>
-            <div v-if="!subscription" class="not-subscribed">
+            <div v-if="!subscription && isOwnPackage" class="not-subscribed">
+              <p class="status-text">这是你自己发布的订阅包，不能在模版市场申请订阅。</p>
+              <p class="owner-hint">如需自己使用，请回到 KOL 工作台，在订阅包菜单中点击「订阅自己」。</p>
+            </div>
+            <div v-else-if="!subscription" class="not-subscribed">
               <p class="status-text">您尚未订阅该 KOL 提示词包。</p>
               <a-button
                 type="primary"
@@ -208,7 +213,7 @@ function goBack() {
                 </div>
               </div>
               <a-button
-                v-if="subscription.status === 'expired' || subscription.status === 'revoked'"
+                v-if="!isOwnPackage && (subscription.status === 'expired' || subscription.status === 'revoked')"
                 type="primary"
                 block
                 size="large"
@@ -471,6 +476,17 @@ function goBack() {
   margin-bottom: 24px;
 }
 
+.owner-hint {
+  color: #64748b;
+  font-size: 13px;
+  line-height: 1.7;
+  background: #f8fafc;
+  border: 1px solid #e2e8f0;
+  border-radius: 8px;
+  padding: 12px;
+  margin: -8px 0 4px;
+}
+
 .status-badge {
   margin-bottom: 20px;
 }