feat: 系统优化Phase2 - 面包屑导航/侧边栏间距/制度公示阅读签收/模板变量中文化/通知类型补全

- 面包屑导航组件，集成至TopNav header
- 侧边栏菜单分组间距增大，分组间分隔线
- 制度公示员工阅读签收：PolicyReadRecord模型、portal路由、管理端阅读统计
- 修复Policies.tsx民主程序推进bug（字段名/API路径/参数）
- 用工文本模板变量名英文转中文显示
- 通知类型TYPE_LABELS补全(RISK_ALERT/SOCIAL_INS/OVERTIME_ALERT/PAYSLIP_READY)
- 通知示例数据补充
- h2标题统一为text-sm font-medium
- 新增run.md

frontend/src/pages/Settings.tsx

@@ -80,7 +80,7 @@ export default function Settings() {
       {activeSection === 'import' && <ImportSettings />}
       {activeSection === 'export' && (
         <Card>
-          <h2 className="font-medium mb-4">数据导出</h2>
+          <h2 className="text-sm font-medium mb-4">数据导出</h2>
           <ExportSettings />
         </Card>
       )}
@@ -111,7 +111,7 @@ function OrgSettings({ orgData, onSave, saving }: { orgData: any; onSave: (data:
 
   return (
     <Card>
-      <h2 className="font-medium mb-4">企业信息</h2>
+      <h2 className="text-sm font-medium mb-4">企业信息</h2>
       <div className="space-y-3">
         <div>
           <Label>企业名称</Label>
@@ -283,7 +283,7 @@ function UserSettings({ usersData }: { usersData: any }) {
   return (
     <Card>
       <div className="flex items-center justify-between mb-4">
-        <h2 className="font-medium">用户管理</h2>
+        <h2 className="text-sm font-medium">用户管理</h2>
         <Button size="sm" onClick={() => setShowAddModal(true)}>
           <Plus className="w-4 h-4 mr-1" />添加用户
         </Button>
@@ -673,7 +673,7 @@ function NotificationSettings() {
   return (
     <div className="space-y-3">
       <Card>
-        <h2 className="font-medium mb-4">通知设置</h2>
+        <h2 className="text-sm font-medium mb-4">通知设置</h2>
         <div className="space-y-3">
           <label className="flex items-center justify-between">
             <span className="text-xs">合同到期提醒</span>
@@ -749,7 +749,7 @@ function NotificationSettings() {
 
       <Card>
         <div className="flex items-center justify-between mb-4">
-          <h2 className="font-medium">合同到期检查</h2>
+          <h2 className="text-sm font-medium">合同到期检查</h2>
           <Button size="sm" onClick={() => checkMutation.mutate()} disabled={checkMutation.isPending}>
             {checkMutation.isPending ? '检查中...' : '立即检查'}
           </Button>