添加 process 参数支持企业微信审批流程动态指定

[Copilot]

企业微信官方API支持通过 process 参数在 use_template_approver=0 时动态指定审批流程节点，但SDK缺少该实现。用户无法根据业务逻辑动态设置审批人。

Changes

Core Classes

• Added process field to WxCpOaApplyEventRequest with Process and ProcessNode nested classes
• Process contains node_list for approval flow nodes
• ProcessNode supports:
  • type: node type (1=approver, 2=notifier, 3=notifier)
  • apv_rel: multi-person approval mode (1=all-sign, 2=or-sign, 3=sequential)
  • userid: array of user IDs

Testing

• Added testToJsonWithProcess() to verify JSON serialization with multiple node types and approval modes

Compatibility

• Existing approver and notifyer fields preserved for backward compatibility

Usage

request.setUseTemplateApprover(0)
  .setProcess(new WxCpOaApplyEventRequest.Process()
    .setNodeList(Arrays.asList(
      // Multi-person all-sign approval node
      new WxCpOaApplyEventRequest.ProcessNode()
        .setType(1).setApvRel(1)
        .setUserIds(new String[]{"user1", "user2"}),
      // Notifier node
      new WxCpOaApplyEventRequest.ProcessNode()
        .setType(2)
        .setUserIds(new String[]{"user3", "user4"})
    )));

Resolves dynamic approver assignment requirement from WeChat Work API.

Original prompt

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This section details on the original issue you should resolve

<issue_title>use_template_approver:0, 关于通过接口指定审批人process参数</issue_title>
<issue_description>

未看到该库和腾讯有对应的方法处理process参数

1、请问能否处理？该怎么处理？审批人要根据业务系统业务数据的逻辑动态给定
2、是否发布新版跟进腾讯官方？何时跟进</issue_description>

Comments on the Issue (you are @copilot in this section)

@binarywang 可能是最近新增的字段吗？如果你了解细节，可以直接提供对应实现的PR代码

Custom agent used: 自定义的
需要用中文

• Fixes use_template_approver:0, 关于通过接口指定审批人process参数 #3751

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