fix: 修复薪资编辑保存失败 + 应发计算丢失细化字段

两个问题：
1. 编辑保存 422 错误：updateEntrySchema 要求 min(0)，但 bonus
   可能为负数（如扣款），导致 Zod 验证失败。放宽为 z.number().optional()
2. 应发不随编辑变化：编辑条目时 inputs 只合并 5 个基本字段，
   丢失了 positionSalary/performanceSalary 等细化字段，
   导致 calcBatchEntry 计算的 totalPay 不包含细化薪资项。
   修复：从 entry 中补全所有细化字段

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

backend/src/routes/payroll2.routes.ts

@@ -520,15 +520,15 @@ router.post('/batches', async (req: AuthRequest, res: Response, next: NextFuncti
 
 // 编辑批次条目（计算依据项 + 社保公积金手动覆盖）
 const updateEntrySchema = z.object({
-  baseSalary: z.number().min(0).optional(),
-  overtimePay: z.number().min(0).optional(),
-  allowance: z.number().min(0).optional(),
-  deduction: z.number().min(0).optional(),
-  bonus: z.number().min(0).optional(),
-  socialEmp: z.number().min(0).optional(),
-  socialOrg: z.number().min(0).optional(),
-  housingEmp: z.number().min(0).optional(),
-  housingOrg: z.number().min(0).optional(),
+  baseSalary: z.number().optional(),
+  overtimePay: z.number().optional(),
+  allowance: z.number().optional(),
+  deduction: z.number().optional(),
+  bonus: z.number().optional(),
+  socialEmp: z.number().optional(),
+  socialOrg: z.number().optional(),
+  housingEmp: z.number().optional(),
+  housingOrg: z.number().optional(),
 })
 
 router.put('/batches/:batchId/entries/:employeeId', async (req: AuthRequest, res: Response, next: NextFunction) => {
@@ -546,13 +546,21 @@ router.put('/batches/:batchId/entries/:employeeId', async (req: AuthRequest, res
     })
     if (!entry) return res.status(404).json({ success: false, error: { code: 'NOT_FOUND', message: '条目不存在' } })
 
-    // 合并输入项
+    // 合并输入项（包含细化薪资字段，避免编辑时丢失岗位工资/绩效工资等）
     const inputs = {
       baseSalary: data.baseSalary ?? entry.baseSalary,
       overtimePay: data.overtimePay ?? entry.overtimePay,
       allowance: data.allowance ?? entry.allowance,
       deduction: data.deduction ?? entry.deduction,
       bonus: data.bonus ?? entry.bonus,
+      positionSalary: entry.positionSalary || undefined,
+      performanceSalary: entry.performanceSalary || undefined,
+      senioritySalary: entry.senioritySalary || undefined,
+      transportAllowance: entry.transportAllowance || undefined,
+      mealAllowance: entry.mealAllowance || undefined,
+      housingAllowance: entry.housingAllowance || undefined,
+      communicationAllowance: entry.communicationAllowance || undefined,
+      otherDeduction: entry.otherDeduction || undefined,
     }
 
     // 构建社保覆盖参数（如果请求中包含社保字段）