feat: TurboHR 14项优化与功能增强

- #1 Dashboard风险提醒增加立刻办理按钮
- #2 Calendar月份选择器改为input month
- #3 Termination增加7种解聘原因法律依据和操作步骤
- #5 合同审查支持PDF TXT格式
- #6 AI合同审查prompt优化为具体修改建议
- #7 知识库添加更新机制说明
- #9 SpecialStatus员工选择改用all-lite接口
- #10 Termination增加详细法律条款引用
- #11 Money发薪批次增加社保公积金合计列
- #12 EmployeeAttachment扩展文件类型
- #13 花名册增加女职工干部工人选项加退休提醒
- #14 新增公司备用文件上传模块

backend/prisma/schema.prisma

@@ -55,6 +55,7 @@ enum RiskType {
   TERMINATION
   MONTHLY
   ONBOARDING
+  RETIREMENT
 }
 
 enum RiskLevel {
@@ -180,6 +181,7 @@ model Organization {
   enterpriseTemplates  EnterpriseTemplate[]
   attendancePublishes  AttendancePublish[]
   specialStatuses      EmployeeSpecialStatus[]
+  companyFiles         CompanyFile[]
 }
 
 model User {
@@ -503,7 +505,7 @@ model EmployeeAttachment {
   employeeId  String
   employee    Employee  @relation(fields: [employeeId], references: [id], onDelete: Cascade)
   fileName    String
-  fileType    String   // ID_CARD / BANK_CARD / CONTRACT_SCAN / EDUCATION / DISCIPLINARY / OTHER
+  fileType    String   // ID_CARD / BANK_CARD / CONTRACT_SCAN / EDUCATION / TERMINATION_DOC / RETIREMENT_DOC / INJURY_CERT / MEDICAL_CERT / PREGNANCY_CERT / DISCIPLINARY / OTHER
   fileUrl     String
   fileSize    Int      @default(0)
   // 关联违纪记录（可选）
@@ -515,6 +517,24 @@ model EmployeeAttachment {
   @@index([disciplinaryRecordId])
 }
 
+// ========== 公司备用文件 ==========
+model CompanyFile {
+  id          String   @id @default(cuid())
+  orgId       String
+  org         Organization @relation(fields: [orgId], references: [id], onDelete: Cascade)
+  fileName    String
+  fileType    String   // BUSINESS_LICENSE=营业执照 / WORK_HOURS=工时备案 / HR_POLICY=制度文件 / LABOR_CONTRACT_TEMPLATE=合同模板 / OTHER=其他
+  fileUrl     String
+  fileSize    Int      @default(0)
+  remark      String?  // 备注
+  expiryDate  DateTime? // 有效期（如营业执照到期日）
+  uploadedBy  String
+  createdAt   DateTime @default(now())
+  updatedAt   DateTime @updatedAt
+
+  @@index([orgId, fileType])
+}
+
 // ========== 仲裁证据链 ==========
 
 model DisciplinaryRecord {