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。

server/src/app/models/__init__.py

@@ -5,6 +5,7 @@ from app.models.approval import ApprovalRecord
 from app.models.audit_log import AuditLog
 from app.models.budget import BudgetAllocation, BudgetReservation, BudgetTransaction
 from app.models.employee_change_log import EmployeeChangeLog
+from app.models.employee_behavior_profile import EmployeeBehaviorProfileSnapshot
 from app.models.employee import Employee
 from app.models.financial_record import (
     AccountsPayableRecord,
@@ -37,6 +38,7 @@ __all__ = [
     "BudgetReservation",
     "BudgetTransaction",
     "Employee",
+    "EmployeeBehaviorProfileSnapshot",
     "EmployeeChangeLog",
     "ExpenseClaim",
     "ExpenseClaimItem",