feat: 新增预算费控模型与报销审批流引擎

后端新增预算费控服务和报销单审批流模块，引入申请人费用画像
算法，优化知识库 RAG 运行时和同步逻辑，完善报销单工作流常
量和明细同步，更新差旅报销规则电子表格，前端新增预算分析
组件和数字员工模型，完善审批对话框和洞察面板交互，优化侧
边栏和顶栏样式，补充单元测试。

web/src/assets/styles/views/policies-view.css

@@ -36,12 +36,12 @@
   overflow: hidden;
 }
 
-.panel-title {
-  display: flex;
-  align-items: flex-start;
-  justify-content: space-between;
-  gap: 16px;
-}
+.panel-title {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 16px;
+}
 
 .panel-title h2,
 .preview-head h2 {
@@ -86,9 +86,17 @@
   background: transparent;
 }
 
-.file-search input:focus {
-  outline: none;
-}
+.file-search input:focus {
+  outline: none;
+}
+
+.panel-tools {
+  min-width: min(470px, 100%);
+  display: flex;
+  align-items: center;
+  justify-content: flex-end;
+  gap: 10px;
+}
 
 .library-body {
   min-height: 0;
@@ -101,11 +109,11 @@
 .folder-rail {
   min-height: 0;
   display: grid;
-  grid-template-rows: minmax(0, 1fr) auto;
+  grid-template-rows: minmax(0, 1fr);
   gap: 12px;
-  border-right: 1px solid #edf2f7;
-  padding-right: 12px;
-}
+  border-right: 1px solid #edf2f7;
+  padding-right: 12px;
+}
 
 .folder-tree {
   min-height: 0;
@@ -148,45 +156,38 @@
   font-size: 11px;
 }
 
-.folder-sync-block {
-  display: grid;
-  gap: 8px;
-}
-
-.new-folder-btn {
+.knowledge-sync-btn {
   min-height: 36px;
   display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  gap: 8px;
-  border: 1px solid rgba(var(--theme-primary-rgb), .28);
-  border-radius: 8px;
-  background: var(--theme-primary-light-9);
-  color: var(--theme-primary-active);
-  font-size: 13px;
-  font-weight: 850;
-}
-
-.new-folder-btn.fixed {
-  border-color: rgba(148, 163, 184, 0.3);
-  background: #f8fafc;
-  color: #64748b;
-}
-
-.knowledge-sync-btn:not(:disabled) {
+  align-items: center;
+  justify-content: center;
+  gap: 7px;
+  padding: 0 14px;
+  border: 1px solid #1d4ed8;
+  border-radius: 8px;
+  background: #2563eb;
+  color: #fff;
+  font-size: 13px;
+  font-weight: 850;
+  white-space: nowrap;
+  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.18);
   cursor: pointer;
+  transition: background 160ms ease, border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
 }
 
-.knowledge-sync-btn:not(:disabled):hover {
-  border-color: rgba(var(--theme-primary-rgb), 0.38);
-  background: var(--theme-primary-light-9);
-  color: var(--theme-primary-active);
+.knowledge-sync-btn:hover:not(:disabled) {
+  border-color: #1e40af;
+  background: #1d4ed8;
+  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.24);
+  transform: translateY(-1px);
 }
 
-.folder-sync-meta {
+.knowledge-sync-btn:disabled {
+  cursor: not-allowed;
+  border-color: #cbd5e1;
+  background: #e2e8f0;
   color: #64748b;
-  font-size: 12px;
-  line-height: 1.6;
+  box-shadow: none;
 }
 
 .document-area {
@@ -1179,6 +1180,12 @@ th {
     align-items: stretch;
   }
 
+  .panel-tools,
+  .file-search,
+  .knowledge-sync-btn {
+    width: 100%;
+  }
+
   .summary-grid,
   .list-foot {
     grid-template-columns: 1fr;