refactor(oa): 优化 OA 模块代码结构 Java8版本

- 银行相关代码：将 BankController、BankDao、BankService移至合适的包结构
- 数据范围控制器：将 DataScopeController移至 controller 包
- 企业相关代码：将 EnterpriseController、EnterpriseEmployeeManager、EnterpriseService 移至合适的包结构
- 发票相关代码：将 InvoiceController、InvoiceDao、InvoiceService 移至合适的包结构
- 更新相关 XML映射文件的命名空间

smart-admin-api-java8-springboot2/sa-admin/src/main/resources/mapper/business/oa/bank/BankMapper.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
-<mapper namespace="net.lab1024.sa.admin.module.business.oa.bank.BankDao">
+<mapper namespace="net.lab1024.sa.admin.module.business.oa.bank.dao.BankDao">
     <update id="deleteBank">
         UPDATE t_oa_bank
         SET deleted_flag = #{deletedFlag}

smart-admin-api-java8-springboot2/sa-admin/src/main/resources/mapper/business/oa/invoice/InvoiceMapper.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
-<mapper namespace="net.lab1024.sa.admin.module.business.oa.invoice.InvoiceDao">
+<mapper namespace="net.lab1024.sa.admin.module.business.oa.invoice.dao.InvoiceDao">
     <update id="deleteInvoice">
         UPDATE t_oa_invoice
         SET deleted_flag = #{deletedFlag}