feat: 账户关联根部门 + 员工新增自动带出账户

1. 账户管理：新建/编辑时可勾选关联 level=0 根部门（公司/分公司/子公司）
2. 后端新增 API：
   - PUT /social/accounts/:id/departments 批量关联根部门
   - GET /social/accounts/:id/departments 查询已关联部门
   - GET /social/department-account/:departmentId 按部门带出适用账户+标准
3. 部门更新 API 支持 socialAccountId/housingAccountId 字段
4. 员工新增表单：选定部门后自动带出社保公积金账户，可手动调整
5. 参保记录创建时写入 accountId

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

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

backend/src/routes/department.routes.ts

@@ -16,7 +16,10 @@ const createDeptSchema = z.object({
   description: z.string().max(200).optional(),
 })
 
-const updateDeptSchema = createDeptSchema.partial()
+const updateDeptSchema = createDeptSchema.partial().extend({
+  socialAccountId: z.string().nullable().optional(),
+  housingAccountId: z.string().nullable().optional(),
+})
 
 /** 获取部门树 */
 router.get('/', authMiddleware, async (req: AuthRequest, res, next) => {
@@ -109,6 +112,8 @@ router.put('/:id', authMiddleware, async (req: AuthRequest, res, next) => {
         ...(data.sortOrder !== undefined ? { sortOrder: data.sortOrder } : {}),
         ...(data.description !== undefined ? { description: data.description } : {}),
         ...(level !== undefined ? { level } : {}),
+        ...(data.socialAccountId !== undefined ? { socialAccountId: data.socialAccountId } : {}),
+        ...(data.housingAccountId !== undefined ? { housingAccountId: data.housingAccountId } : {}),
       },
     })
     res.json({ success: true, data: dept })

backend/src/routes/social.routes.ts

@@ -231,6 +231,103 @@ router.post('/accounts/:accountId/standards', async (req: AuthRequest, res: Resp
   } catch (err) { next(err) }
 })
 
+// 账户关联根部门（level=0）批量设置
+router.put('/accounts/:id/departments', async (req: AuthRequest, res: Response, next: NextFunction) => {
+  try {
+    const orgId = req.user!.orgId
+    const { id } = req.params
+    const { departmentIds } = req.body as { departmentIds: string[] }
+    const account = await prisma.socialAccount.findFirst({ where: { id, orgId } })
+    if (!account) return res.status(404).json({ success: false, error: { code: 'NOT_FOUND', message: '账户不存在' } })
+
+    // 先清除该账户的所有部门关联
+    const field = account.type === 'SOCIAL' ? 'socialAccountId' : 'housingAccountId'
+    await prisma.department.updateMany({
+      where: { orgId, [field]: id },
+      data: { [field]: null },
+    })
+    // 批量设置新关联（仅 level=0 根部门）
+    if (departmentIds && departmentIds.length > 0) {
+      await prisma.department.updateMany({
+        where: { id: { in: departmentIds }, orgId, level: 0 },
+        data: { [field]: id },
+      })
+    }
+    res.json({ success: true, data: { message: `已关联 ${departmentIds?.length || 0} 个根部门` } })
+  } catch (err) { next(err) }
+})
+
+// 获取账户已关联的根部门列表
+router.get('/accounts/:id/departments', async (req: AuthRequest, res: Response, next: NextFunction) => {
+  try {
+    const orgId = req.user!.orgId
+    const { id } = req.params
+    const account = await prisma.socialAccount.findFirst({ where: { id, orgId } })
+    if (!account) return res.status(404).json({ success: false, error: { code: 'NOT_FOUND', message: '账户不存在' } })
+
+    const field = account.type === 'SOCIAL' ? 'socialAccountId' : 'housingAccountId'
+    const departments = await prisma.department.findMany({
+      where: { orgId, level: 0, [field]: id },
+      select: { id: true, name: true },
+    })
+    res.json({ success: true, data: departments })
+  } catch (err) { next(err) }
+})
+
+// 按部门获取适用账户（选部门时自动带出）
+router.get('/department-account/:departmentId', async (req: AuthRequest, res: Response, next: NextFunction) => {
+  try {
+    const orgId = req.user!.orgId
+    const { departmentId } = req.params
+    // 向上找到 level=0 的根部门
+    let currentDept: any = await prisma.department.findFirst({ where: { id: departmentId, orgId } })
+    if (!currentDept) return res.status(404).json({ success: false, error: { code: 'NOT_FOUND', message: '部门不存在' } })
+
+    while (currentDept && currentDept.level > 0 && currentDept.parentId) {
+      currentDept = await prisma.department.findUnique({ where: { id: currentDept.parentId } })
+    }
+    const rootDeptId = currentDept?.id || null
+
+    let socialAccount: any = null
+    let housingAccount: any = null
+    if (rootDeptId) {
+      const rootDept = await prisma.department.findUnique({
+        where: { id: rootDeptId },
+        include: { socialAccount: true, housingAccount: true },
+      })
+      socialAccount = rootDept?.socialAccount || null
+      housingAccount = rootDept?.housingAccount || null
+    }
+
+    // 回退到公司默认账户
+    if (!socialAccount) {
+      socialAccount = await prisma.socialAccount.findFirst({ where: { orgId, type: 'SOCIAL', isDefault: true } })
+    }
+    if (!housingAccount) {
+      housingAccount = await prisma.socialAccount.findFirst({ where: { orgId, type: 'HOUSING', isDefault: true } })
+    }
+
+    // 获取当前生效标准
+    const currentMonth = new Date().toISOString().slice(0, 7)
+    let socialStandard: any = null
+    let housingStandard: any = null
+    if (socialAccount) {
+      socialStandard = await prisma.socialYearStandard.findFirst({
+        where: { accountId: socialAccount.id, isCurrent: true },
+        orderBy: { effectiveFrom: 'desc' },
+      })
+    }
+    if (housingAccount) {
+      housingStandard = await prisma.socialYearStandard.findFirst({
+        where: { accountId: housingAccount.id, isCurrent: true },
+        orderBy: { effectiveFrom: 'desc' },
+      })
+    }
+
+    res.json({ success: true, data: { socialAccount, housingAccount, socialStandard, housingStandard } })
+  } catch (err) { next(err) }
+})
+
 // 按员工获取适用账户（通过根部门 level=0 继承，不向下到普通部门）
 router.get('/employee-account/:employeeId', async (req: AuthRequest, res: Response, next: NextFunction) => {
   try {

backend/src/services/contract.service.ts

@@ -396,6 +396,7 @@ export async function createEmployee(orgId: string, userId: string, data: any) {
         changeType: 'ONBOARDING',
         createdBy: userId,
         city: data.city || '北京',
+        accountId: data.socialAccountId || null,
       },
     })
 
@@ -409,6 +410,7 @@ export async function createEmployee(orgId: string, userId: string, data: any) {
         changeType: 'ONBOARDING',
         createdBy: userId,
         city: data.city || '北京',
+        accountId: data.housingAccountId || null,
       },
     })