fix: 公积金基数上下限独立于社保

问题：SocialYearStandard 只有一套 baseMin/baseMax，社保和公积金
共用，但公积金下限通常是最低工资标准（如北京2420），远低于社保
下限（如北京6326）。

修复：
- SocialYearStandard 新增 housingBaseMin/housingBaseMax 字段
- clampHousingFundBase 优先用公积金专用上下限，为0时回退到社保
- calcHousingFund 同样优先用公积金专用上下限
- 前端公积金年度标准表单加公积金基数上下限输入
- 前端公积金当前标准展示用公积金专用上下限

同时修复 blank_employees/blank_all 模式跳过试用期工资覆盖

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

frontend/src/pages/social-insurance/AccountCard.tsx

@@ -52,6 +52,7 @@ export function AccountCard({
     // 公积金字段
     accountType: account.accountType || 'BASIC',
     housingOrg: 12, housingEmp: 12,
+    housingBaseMin: 0, housingBaseMax: 0,
   })
 
   // 查询当前年度标准（展开时才查询）
@@ -331,8 +332,8 @@ export function AccountCard({
                   )}
                   <div className="grid md:grid-cols-4 gap-3 text-sm">
                     <div className="flex justify-between border-b pb-1.5"><span className="text-gray-500">账户类型</span><span className="font-medium">{config.accountType === 'SUPPLEMENTARY' ? '补充公积金' : '基本公积金'}</span></div>
-                    <div className="flex justify-between border-b pb-1.5"><span className="text-gray-500">缴费基数下限</span><span className="font-medium">¥{fmt(config.baseMin)}</span></div>
-                    <div className="flex justify-between border-b pb-1.5"><span className="text-gray-500">缴费基数上限</span><span className="font-medium">¥{fmt(config.baseMax)}</span></div>
+                    <div className="flex justify-between border-b pb-1.5"><span className="text-gray-500">缴费基数下限</span><span className="font-medium">¥{fmt(config.housingBaseMin > 0 ? config.housingBaseMin : config.baseMin)}</span></div>
+                    <div className="flex justify-between border-b pb-1.5"><span className="text-gray-500">缴费基数上限</span><span className="font-medium">¥{fmt(config.housingBaseMax > 0 ? config.housingBaseMax : config.baseMax)}</span></div>
                     <div className="flex justify-between border-b pb-1.5"><span className="text-gray-500">公积金(企业)</span><span className="font-medium">{config.housingOrg}%</span></div>
                     <div className="flex justify-between border-b pb-1.5"><span className="text-gray-500">公积金(个人)</span><span className="font-medium">{config.housingEmp}%</span></div>
                   </div>
@@ -610,6 +611,8 @@ export function AccountCard({
                       </div>
                       <div><Label>公积金(企业%)</Label><Input type="number" step="0.1" value={newVersion.housingOrg} onChange={(e) => setNewVersion({ ...newVersion, housingOrg: Number(e.target.value) })} /></div>
                       <div><Label>公积金(个人%)</Label><Input type="number" step="0.1" value={newVersion.housingEmp} onChange={(e) => setNewVersion({ ...newVersion, housingEmp: Number(e.target.value) })} /></div>
+                      <div><Label>公积金基数下限</Label><Input type="number" value={newVersion.housingBaseMin} onChange={(e) => setNewVersion({ ...newVersion, housingBaseMin: Number(e.target.value) })} placeholder="0=用社保下限" /><p className="text-xs text-gray-400 mt-1">0 时使用缴费基数下限</p></div>
+                      <div><Label>公积金基数上限</Label><Input type="number" value={newVersion.housingBaseMax} onChange={(e) => setNewVersion({ ...newVersion, housingBaseMax: Number(e.target.value) })} placeholder="0=用社保上限" /><p className="text-xs text-gray-400 mt-1">0 时使用缴费基数上限</p></div>
                     </div>
                   </>
                 ) : (