fix: 修复付款金额验证逻辑，调整可付款余额计算

yuan

2026-09-22 8b2d472c84386dcd8d1726c5f6edee00f3d5867c

 src/views/collaborativeApproval/enterpriseBook/index.vue

@@ -275,8 +275,8 @@
        </el-form-item>
      </el-form>
      <template #footer>
        <el-button @click="showAddContactDialog = false">取消</el-button>
        <el-button type="primary" @click="addContact">确定</el-button>
        <el-button @click="showAddContactDialog = false">取消</el-button>
      </template>
    </el-dialog>
  </div>