fix: 后端对非劳动合同类型 socialInsBase/housingFundBase 返回 null

不再在数据源头返回社保基数和公积金基数，而非前端隐藏

backend/src/routes/roster.routes.ts

@@ -222,8 +222,16 @@ router.get('/', authMiddleware, async (req: AuthRequest, res, next) => {
         monthlySalary: safeDecrypt(e.monthlySalary),
         baseSalary: e.baseSalary ? safeDecrypt(e.baseSalary) : null,
         performanceSalary: e.performanceSalary ? safeDecrypt(e.performanceSalary) : null,
-        socialInsBase: e.socialInsBase,
-        housingFundBase: e.housingFundBase,
+        socialInsBase: (() => {
+          const ct = latestContract?.contractType
+          if (!ct || ['LABOR', 'INTERNSHIP', 'PARTTIME', 'OUTSOURCING', 'UNSIGNED'].includes(ct)) return null
+          return e.socialInsBase
+        })(),
+        housingFundBase: (() => {
+          const ct = latestContract?.contractType
+          if (!ct || ['LABOR', 'INTERNSHIP', 'PARTTIME', 'OUTSOURCING', 'UNSIGNED'].includes(ct)) return null
+          return e.housingFundBase
+        })(),
         socialInsCalc: (() => {
           const contractType = latestContract?.contractType
           // 劳务协议、实习协议、兼职协议、业务外包等非劳动合同不缴纳社保

frontend/src/pages/Roster.tsx

@@ -917,11 +917,7 @@ export default function Roster() {
                       })()}
                     </td>}
                     {colVisible('socialInsBase') && <td className="px-4 py-2.5 text-right text-xs">
-                      {(() => {
-                        const ct = e.latestContract?.contractType
-                        if (!ct || ['LABOR', 'INTERNSHIP', 'PARTTIME', 'OUTSOURCING', 'UNSIGNED'].includes(ct)) return <span className="text-gray-300">—</span>
-                        return e.socialInsBase ? e.socialInsBase.toLocaleString() : <span className="text-gray-300">—</span>
-                      })()}
+                      {e.socialInsBase ? e.socialInsBase.toLocaleString() : <span className="text-gray-300">—</span>}
                     </td>}
                     {colVisible('socialInsAmount') && <td className="px-4 py-2.5 text-right">
                       {(() => {