fix(frontend): 移除分类管理列表中的文档数量显示

frontend/src/views/CategoryManager.vue

@@ -26,7 +26,6 @@
           <span v-else style="width:16px;" />
           <strong class="tree-name">{{ node.name }}</strong>
           <span v-if="node.description" class="tree-desc">{{ node.description }}</span>
-          <span class="tree-doc-count">({{ node.documentCount||0 }} 篇)</span>
         </div>
         <t-space :size="4">
           <t-button size="small" variant="text" @click="openEdit(node)">编辑</t-button>
@@ -120,5 +119,4 @@ function countDescendants(node:any):number{if(!node.children?.length)return 0;le
 .tree-arrow{cursor:pointer;user-select:none;font-size:12px;width:16px;text-align:center;color:var(--color-text-tertiary);}
 .tree-name{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
 .tree-desc{color:var(--color-text-tertiary);font-size:12px;margin-left:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
-.tree-doc-count{color:var(--color-text-tertiary);font-size:11px;margin-left:8px;white-space:nowrap;}
 </style>