feat: 新增员工行为画像算法与费用风险标签体系

后端新增员工行为画像算法模块，支持标签规则引擎和评分计算，
完善员工模型、银行信息、序列化和导入逻辑，优化报销审批流
和工作流常量，增强 Hermes 同步和知识同步能力，前端新增费
用画像详情弹窗、雷达图和风险卡片组件，完善登录页和工作台
样式，优化文档中心和归档中心交互，补充单元测试。

web/src/assets/styles/app.css

@@ -166,7 +166,8 @@
   padding: 20px 24px;
 }
 .workarea.workbench-workarea {
-  overflow: hidden;
+  overflow-x: hidden;
+  overflow-y: auto;
   padding: 12px 14px 14px;
 }
 .workarea.settings-workarea {
@@ -191,18 +192,63 @@
   }
 
   .app-sidebar {
-    width: var(--sidebar-collapsed-width);
-    flex: 0 0 var(--sidebar-collapsed-width);
-    transition: none;
+    position: fixed;
+    top: 0;
+    left: 0;
+    bottom: 0;
+    z-index: 1000;
+    width: min(320px, 80vw);
+    max-width: none;
+    transform: translateX(-100%);
+    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+  }
+
+  .app.mobile-sidebar-open .app-sidebar {
+    transform: translateX(0);
   }
 
   .app > .main {
-    flex: 1 1 auto;
-    width: calc(100vw - var(--sidebar-collapsed-width));
+    flex: 1 1 100%;
+    width: 100vw;
   }
 
   .workarea { padding: 18px 16px 28px; }
   .workarea.workbench-workarea { overflow: auto; padding: 14px; }
+
+  .mobile-overlay {
+    position: fixed;
+    inset: 0;
+    background: rgba(0, 0, 0, 0.4);
+    z-index: 999;
+    opacity: 0;
+    pointer-events: none;
+    transition: opacity 0.3s;
+    backdrop-filter: blur(2px);
+  }
+
+  .app.mobile-sidebar-open .mobile-overlay {
+    opacity: 1;
+    pointer-events: auto;
+  }
+
+  .mobile-hamburger-btn {
+    position: fixed;
+    top: 14px;
+    right: 16px;
+    z-index: 90;
+    width: 40px;
+    height: 40px;
+    border-radius: 8px;
+    background: #fff;
+    border: 1px solid rgba(0, 0, 0, 0.08);
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    color: var(--text-primary);
+    font-size: 24px;
+    cursor: pointer;
+  }
 }
 
 @media (prefers-reduced-motion: reduce) {