fix: blank_employees 模式不再自动带出基本工资

本月空白模式应所有金额默认 0，去掉从 emp.monthlySalary 自动填充
基本工资的逻辑，保持与"空白"语义一致。

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

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

frontend/src/pages/SocialInsurance.tsx

@@ -38,6 +38,7 @@ export default function SocialInsurance() {
   const [monthlyMonth, setMonthlyMonth] = useState(new Date().toISOString().slice(0, 7))
   const [monthlyProcessed, setMonthlyProcessed] = useState(false)
   const [processStatus, setProcessStatus] = useState<{ social: any; housing: any } | null>(null)
+  const [minWageInput, setMinWageInput] = useState('0')
   const [newVersion, setNewVersion] = useState<any>({
     effectiveFrom: new Date().toISOString().slice(0, 7),
     city: '北京',
@@ -238,6 +239,27 @@ export default function SocialInsurance() {
     },
   })
 
+  // 快速更新最低工资（无需新建版本）
+  const updateMinWageMutation = useMutation({
+    mutationFn: () => {
+      const accountId = selectedAccountId || activeConfig?.accountId
+      if (!accountId) throw new Error('未选择账户')
+      return socialAccountApi.updateMinWage(accountId, Number(minWageInput) || 0)
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['social-config'] })
+      queryClient.invalidateQueries({ queryKey: ['social-config-versions'] })
+      queryClient.invalidateQueries({ queryKey: ['social-accounts'] })
+      toast.success('最低工资标准已更新')
+    },
+    onError: (err: any) => toast.error(err?.response?.data?.error?.message || '更新失败'),
+  })
+
+  // 当前配置变化时同步最低工资输入框
+  useEffect(() => {
+    setMinWageInput(String(activeConfig?.minWage || 0))
+  }, [activeConfig?.minWage])
+
   const aiSuggestMut = useMutation<any, any, { city: string; effectiveFrom: string; type: 'social' | 'housing' }>({
     mutationFn: async (vars: { city: string; effectiveFrom: string; type: 'social' | 'housing' }) => {
       return await socialInsuranceApi.aiSuggest(vars)
@@ -524,6 +546,27 @@ export default function SocialInsurance() {
               {activeConfig.minWage > 0 && (
                 <div className="flex justify-between border-b pb-1.5"><span className="text-gray-500">最低工资标准</span><span className="font-medium text-primary">¥{fmt(activeConfig.minWage)}</span></div>
               )}
+              {/* 最低工资快速设置（社保 Tab，当前配置区域可直接编辑） */}
+              <div className="flex justify-between items-center border-b pb-1.5">
+                <span className="text-gray-500">最低工资标准</span>
+                <div className="flex items-center gap-2">
+                  <Input
+                    type="number"
+                    value={minWageInput}
+                    onChange={(e) => setMinWageInput(e.target.value)}
+                    placeholder="0"
+                    className="w-24 h-7 text-sm text-right"
+                  />
+                  <Button
+                    size="sm"
+                    variant="secondary"
+                    onClick={() => updateMinWageMutation.mutate()}
+                    disabled={updateMinWageMutation.isPending}
+                  >
+                    {updateMinWageMutation.isPending ? '保存中...' : '保存'}
+                  </Button>
+                </div>
+              </div>
               {Array.isArray(activeConfig.extraInsurances) && activeConfig.extraInsurances.map((ins: any, idx: number) => (
                 <div key={idx} className="flex justify-between border-b pb-1.5">
                   <span className="text-gray-500">{ins.name}(企业/个人)</span>