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。

server/src/app/services/expense_claim_item_sync.py

@@ -12,6 +12,7 @@ from sqlalchemy import inspect as sqlalchemy_inspect
 from app.api.deps import CurrentUserContext
 from app.core.agent_enums import AgentAssetDomain, AgentAssetStatus, AgentAssetType
 from app.models.agent_asset import AgentAsset
+from app.models.employee import Employee
 from app.models.financial_record import ExpenseClaim, ExpenseClaimItem
 from app.schemas.reimbursement import TravelReimbursementCalculatorRequest
 from app.services.agent_asset_rule_library import AgentAssetRuleLibraryManager
@@ -50,7 +51,7 @@ class ExpenseClaimItemSyncMixin:
                 self._discard_claim_item(claim, item)
             return
 
-        grade = str(claim.employee_grade or "").strip()
+        grade = self._resolve_claim_employee_grade(claim)
         if not grade:
             return
 
@@ -115,6 +116,16 @@ class ExpenseClaimItemSyncMixin:
         item.item_amount = allowance_amount
         item.invoice_id = None
 
+    def _resolve_claim_employee_grade(self, claim: ExpenseClaim) -> str:
+        grade = str(claim.employee_grade or "").strip()
+        if grade:
+            return grade
+        employee_id = str(claim.employee_id or "").strip()
+        if not employee_id:
+            return ""
+        employee = self.db.get(Employee, employee_id)
+        return str(employee.grade if employee is not None and employee.grade else "").strip()
+
     def _discard_claim_item(self, claim: ExpenseClaim, item: ExpenseClaimItem) -> None:
         if item in claim.items:
             claim.items.remove(item)