feat(system): 通知管理与文件选择器来源筛选

- 新增通知管理（渠道卡片化、模板 CRUD、参数按钮插入）

- ImageSelector/AvatarSelector 增加上传来源 is_admin 筛选

- 宿主机详情页实时指标与硬件/网卡 IPv6 展示优化

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/admin/ImageSelector.vue

@@ -33,6 +33,10 @@
                 @input="handleSearch"
                 style="width: 300px;"
               />
+              <el-select v-model="sourceFilter" placeholder="上传来源" clearable style="width: 130px; margin-left: 12px;" @change="handleSourceChange">
+                <el-option label="管理员" :value="true" />
+                <el-option label="用户" :value="false" />
+              </el-select>
             </div>
             
             <div class="file-grid" v-loading="loading">
@@ -178,6 +182,7 @@ const currentPage = ref(1)
 const pageSize = ref(12)
 const total = ref(0)
 const searchKeyword = ref('')
+const sourceFilter = ref(undefined)
 const pendingFiles = ref([]) // 待上传文件列表
 const uploading = ref(false) // 批量上传中
 let fetchVersion = 0 // 防止 fetchFileList 竞态条件
@@ -190,6 +195,7 @@ watch(() => props.modelValue, (newVal) => {
     selectedIds.value = new Set()
     currentPage.value = 1
     searchKeyword.value = ''
+    sourceFilter.value = undefined
     fetchFileList()
   }
 })
@@ -224,10 +230,11 @@ const fetchFileList = async () => {
   loading.value = true
   
   try {
-    const res = await getFileList({ 
-      page: currentPage.value,
-      count: pageSize.value
-    })
+    const params = { page: currentPage.value, count: pageSize.value }
+    if (sourceFilter.value !== undefined && sourceFilter.value !== null && sourceFilter.value !== '') {
+      params.is_admin = sourceFilter.value
+    }
+    const res = await getFileList(params)
     
     // 如果有更新的请求发起，丢弃当前结果
     if (currentFetchVersion !== fetchVersion) return
@@ -285,10 +292,15 @@ const handleTabClick = (tab) => {
 
 // 处理搜索
 const handleSearch = () => {
-  // 搜索时重置到第一页
   currentPage.value = 1
 }
 
+// 来源筛选变化
+const handleSourceChange = () => {
+  currentPage.value = 1
+  fetchFileList()
+}
+
 // 分页处理
 const handleSizeChange = (size) => {
   pageSize.value = size
@@ -436,6 +448,7 @@ const handleClose = () => {
   currentPage.value = 1
   total.value = 0
   searchKeyword.value = ''
+  sourceFilter.value = undefined
   // 清理待上传文件的预览URL
   pendingFiles.value.forEach(f => {
     if (f.previewUrl) URL.revokeObjectURL(f.previewUrl)
@@ -495,6 +508,8 @@ const handleConfirm = () => {
 
 .filter-section {
   margin-bottom: 20px;
+  display: flex;
+  align-items: center;
 }
 
 .file-grid {