feat(portal): replace hardcoded '24/7 内网' stat with live resource count

Backend: bootstrap() now returns stats.total_resources (count of
is_active=True resources).
Frontend: stats adds 'resources' computed from bootstrapStats;
third hero-stat shows '{{ stats.resources }} 资源数量' instead of
the static '24/7 内网' placeholder.

backend/routes/portal.py

@@ -22,6 +22,9 @@ def bootstrap():
     )
     return jsonify({
         "settings": settings,
+        "stats": {
+            "total_resources": Resource.query.filter_by(is_active=True).count(),
+        },
         "categories": [c.to_dict() for c in categories],
         "links": [l.to_dict() for l in links],
     })

frontend/src/views/Portal.vue

@@ -57,14 +57,18 @@ const activeCat = computed(() => categories.value.find(c => c.id === activeCatId
 
 const stats = computed(() => ({
   categories: categories.value.length,
-  links: links.value.length
+  links: links.value.length,
+  resources: bootstrapStats.value.total_resources || 0
 }))
 
+const bootstrapStats = ref({ total_resources: 0 })
+
 async function loadBootstrap() {
   loading.value = true
   try {
     const { data } = await portalApi.bootstrap()
     settings.value = data.settings || {}
+    bootstrapStats.value = data.stats || { total_resources: 0 }
     categories.value = data.categories || []
     links.value = data.links || []
     document.title = settings.value.site_name || 'OPS 资源中心'
@@ -183,7 +187,7 @@ onMounted(() => {
           <div class="hero-stats">
             <div class="hero-stat"><b>{{ stats.categories }}</b><span>资源分类</span></div>
             <div class="hero-stat"><b>{{ stats.links }}</b><span>快捷入口</span></div>
-            <div class="hero-stat"><b>内网</b><span>访问入口</span></div>
+            <div class="hero-stat"><b>{{ stats.resources }}</b><span>资源数量</span></div>
           </div>
         </div>