feat(aihr): 重构运营后台与租户知识治理

- 重构运营总览、侧栏和内容运营工作台\n- 增加大喇叭、成果审核与运营统计链路\n- 补齐租户、知识空间、分类和知识维护闭环\n- 加固标签页租户上下文、停用租户写保护与迁移预检

frontend/src/components/Hamburger/index.vue

@@ -1,11 +1,27 @@
 <template>
-  <div style="padding: 0 15px" @click="toggleClick">
-    <svg :class="{ 'is-active': isActive }" class="hamburger" viewBox="0 0 1024 1024" xmlns="http://www.w3.org/2000/svg" width="64" height="64">
+  <button
+    type="button"
+    class="hamburger-trigger"
+    :aria-label="isActive ? '收起侧栏' : '展开侧栏'"
+    :aria-expanded="isActive"
+    aria-controls="main-navigation"
+    @click="toggleClick"
+  >
+    <svg
+      :class="{ 'is-active': isActive }"
+      class="hamburger"
+      viewBox="0 0 1024 1024"
+      xmlns="http://www.w3.org/2000/svg"
+      width="64"
+      height="64"
+      aria-hidden="true"
+      focusable="false"
+    >
       <path
         d="M408 442h480c4.4 0 8-3.6 8-8v-56c0-4.4-3.6-8-8-8H408c-4.4 0-8 3.6-8 8v56c0 4.4 3.6 8 8 8zm-8 204c0 4.4 3.6 8 8 8h480c4.4 0 8-3.6 8-8v-56c0-4.4-3.6-8-8-8H408c-4.4 0-8 3.6-8 8v56zm504-486H120c-4.4 0-8 3.6-8 8v56c0 4.4 3.6 8 8 8h784c4.4 0 8-3.6 8-8v-56c0-4.4-3.6-8-8-8zm0 632H120c-4.4 0-8 3.6-8 8v56c0 4.4 3.6 8 8 8h784c4.4 0 8-3.6 8-8v-56c0-4.4-3.6-8-8-8zM142.4 642.1L298.7 519a8.84 8.84 0 0 0 0-13.9L142.4 381.9c-5.8-4.6-14.4-.5-14.4 6.9v246.3a8.9 8.9 0 0 0 14.4 7z"
       />
     </svg>
-  </div>
+  </button>
 </template>
 
 <script setup lang="ts">
@@ -22,6 +38,22 @@ const toggleClick = () => {
 </script>
 
 <style scoped>
+.hamburger-trigger {
+  display: flex;
+  height: 50px;
+  padding: 0 15px;
+  align-items: center;
+  border: 0;
+  background: transparent;
+  color: inherit;
+  cursor: pointer;
+
+  &:focus-visible {
+    outline: 2px solid #236fd7;
+    outline-offset: -3px;
+  }
+}
+
 .hamburger {
   display: inline-block;
   vertical-align: middle;