feat: 电子签全场景集成+场景筛选+设置开关

- ESignRecord 模型新增 scene 字段（CONTRACT/RESIGNATION/POLICY/PAYSLIP/ONBOARDING）
- Organization 模型新增3个电子签开关：esignPolicyEnabled/esignPayslipEnabled/esignOnboardingEnabled
- 设置页面企业信息新增电子签署设置区域，3个开关各自独立，缺省关闭
- 规章制度签收：开启电子签后，员工阅读确认时自动创建POLICY场景签署记录
- 工资条确认：开启电子签后，员工确认工资条时自动创建PAYSLIP场景签署记录
- 入职文件签署：开启电子签后，HR审批通过入职流程时自动创建ONBOARDING场景签署记录
- 电子签署列表增加场景筛选下拉（全部场景/劳动合同/离职协议/规章制度/工资条/入职文件）
- 管理端和员工端列表均展示场景标签（基于scene字段，替代硬编码判断）
- 合同和离职流程的esign调用已加scene参数

frontend/src/pages/ESign.tsx

@@ -19,9 +19,18 @@ const STATUS_CONFIG: Record<string, { label: string; color: string }> = {
   CANCELLED: { label: '已取消', color: 'bg-gray-100 text-gray-500' },
 }
 
+const SCENE_CONFIG: Record<string, { label: string; color: string }> = {
+  CONTRACT: { label: '劳动合同', color: 'bg-blue-50 text-blue-600 border border-blue-200' },
+  RESIGNATION: { label: '离职协议', color: 'bg-orange-50 text-orange-600 border border-orange-200' },
+  POLICY: { label: '规章制度', color: 'bg-amber-50 text-amber-600 border border-amber-200' },
+  PAYSLIP: { label: '工资条', color: 'bg-emerald-50 text-emerald-600 border border-emerald-200' },
+  ONBOARDING: { label: '入职文件', color: 'bg-purple-50 text-purple-600 border border-purple-200' },
+}
+
 export default function ESign() {
   const queryClient = useQueryClient()
   const [filterStatus, setFilterStatus] = useState('')
+  const [filterScene, setFilterScene] = useState('')
   const [showCreate, setShowCreate] = useState(false)
   const [formData, setFormData] = useState({
     employeeId: '',
@@ -30,9 +39,9 @@ export default function ESign() {
   })
 
   const { data: records = [], isLoading } = useQuery<any[]>({
-    queryKey: ['esign-records', filterStatus],
+    queryKey: ['esign-records', filterStatus, filterScene],
     queryFn: async () => {
-      return await esignApi.list(filterStatus || undefined)
+      return await esignApi.list({ status: filterStatus || undefined, scene: filterScene || undefined })
     },
   })
 
@@ -114,6 +123,14 @@ export default function ESign() {
             <option value="">全部状态</option>
             {Object.entries(STATUS_CONFIG).map(([k, v]) => <option key={k} value={k}>{v.label}</option>)}
           </select>
+          <select
+            value={filterScene}
+            onChange={(e) => setFilterScene(e.target.value)}
+            className="h-9 rounded-md border border-gray-200 bg-white px-3 text-sm text-gray-700 shadow-sm outline-none transition focus:border-primary focus:ring-2 focus:ring-primary/10"
+          >
+            <option value="">全部场景</option>
+            {Object.entries(SCENE_CONFIG).map(([k, v]) => <option key={k} value={k}>{v.label}</option>)}
+          </select>
         </div>
         <Button size="sm" onClick={() => setShowCreate(true)}>
           <Plus className="w-4 h-4 mr-1" />发起签署
@@ -149,11 +166,8 @@ export default function ESign() {
                         <div className="flex items-center gap-1.5">
                           <FileText className="w-3.5 h-3.5 text-gray-400 shrink-0" />
                           <span className="font-medium truncate max-w-[200px]">{r.documentTitle}</span>
-                          {r.contractId && (
-                            <span className="px-1.5 py-0.5 rounded text-xs bg-blue-50 text-blue-600 border border-blue-200 shrink-0">劳动合同</span>
-                          )}
-                          {!r.contractId && r.documentTitle?.includes('离职') && (
-                            <span className="px-1.5 py-0.5 rounded text-xs bg-orange-50 text-orange-600 border border-orange-200 shrink-0">离职协议</span>
+                          {r.scene && SCENE_CONFIG[r.scene] && (
+                            <span className={`px-1.5 py-0.5 rounded text-xs shrink-0 ${SCENE_CONFIG[r.scene].color}`}>{SCENE_CONFIG[r.scene].label}</span>
                           )}
                         </div>
                         {r.remark && <div className="text-xs text-gray-400 mt-0.5">{r.remark}</div>}