feat: 数字员工财务报告体系与定时提醒及看板快照调度

- 新增数字员工财务报告生成、邮件投递与渲染调度器
- 引入员工画像扫描调度与定时提醒任务
- 完善财务看板快照、排行口径与部门人员占比计算
- 优化数字员工工作看板仪表盘与技能目录
- 增强前端总览页图表、工作台摘要与顶部导航栏交互
- 新增差旅申请规划推动提醒与报销创建会话状态管理
- 补充财务报告、看板调度、数字员工工作记录测试覆盖

server/src/app/schemas/finance_dashboard.py

@@ -17,6 +17,7 @@ class FinanceDashboardRead(BaseModel):
     spend_by_category: list[dict[str, Any]] = Field(default_factory=list)
     exception_mix: list[dict[str, Any]] = Field(default_factory=list)
     department_ranking: list[dict[str, Any]] = Field(default_factory=list)
+    department_employee_mix: list[dict[str, Any]] = Field(default_factory=list)
     employee_ranking: list[dict[str, Any]] = Field(default_factory=list)
     top_claims: list[dict[str, Any]] = Field(default_factory=list)
     bottlenecks: list[dict[str, Any]] = Field(default_factory=list)