feat: idCardHash匹配、Roster分页过滤、社保基数调整修复、Modal size支持、Termination版本对比、UI优化

backend/prisma/schema.prisma

@@ -173,6 +173,7 @@ model Employee {
   gender            String?
   phone             String?
   idCardNumber      String?        // AES-256 加密存储
+  idCardHash        String?        // SHA-256 哈希，用于按身份证号查询匹配
   emergencyContact  String?
   emergencyPhone    String?
   address           String?
@@ -209,6 +210,8 @@ model Employee {
   socialInsRecords    EmployeeSocialInsRecord[]
   housingFundRecords  EmployeeHousingFundRecord[]
   departmentRecords   EmployeeDepartmentRecord[]
+
+  @@unique([orgId, idCardHash])
 }
 
 model LaborContract {