feat: support configurable WeCom API base URL for reverse proxy deployment

[Copilot]

概述 / Overview

WeCom has IP whitelist requirements. Users previously had to override api.py files to route calls through a reverse proxy with fixed IPs, causing update conflicts. This adds optional api_base_url configuration to WeCom adapters.

Usage:

{
  "corpid": "ww1234567890abcdef",
  "secret": "your_secret",
  "token": "your_token",
  "EncodingAESKey": "your_aes_key",
  "contacts_secret": "your_contacts_secret",
  "api_base_url": "https://your-proxy.example.com/wecom-api"
}

Changes:

• libs/wecom_api/api.py: Added api_base_url parameter to WecomClient.__init__(), default https://qyapi.weixin.qq.com/cgi-bin
• libs/wecom_customer_service_api/api.py: Added api_base_url parameter to WecomCSClient.__init__(), same default
• platform/sources/wecom.py: Pass config.get('api_base_url', default) to client
• platform/sources/wecomcs.py: Pass config.get('api_base_url', default) to client

Backward compatible: omitting api_base_url uses default WeCom API endpoint.

更改前后对比截图 / Screenshots

修改前 / Before:

• Users must override library files to use reverse proxy
• Files get overwritten on update, breaking custom configurations

修改后 / After:

• Configuration-based: add api_base_url to adapter config
• Clean upgrades without losing reverse proxy settings

检查清单 / Checklist

PR 作者完成 / For PR author

• 阅读仓库贡献指引了吗？ / Have you read the contribution guide?
• 与项目所有者沟通过了吗？ / Have you communicated with the project maintainer?
• 我确定已自行测试所作的更改，确保功能符合预期。 / I have tested the changes and ensured they work as expected.

项目维护者完成 / For project maintainer

• 相关 issues 链接了吗？ / Have you linked the related issues?
• 配置项写好了吗？迁移写好了吗？生效了吗？ / Have you written the configuration items? Have you written the migration? Has it taken effect?
• 依赖加到 pyproject.toml 和 core/bootutils/deps.py 了吗 / Have you added the dependencies to pyproject.toml and core/bootutils/deps.py?
• 文档编写了吗？ / Have you written the documentation?

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Feature]: 期望支持配置企微api地址</issue_title>
<issue_description>### 这是一个？

新功能

详细描述

企微有IP白名单，希望能自定义api地址，以使用固定公网IP服务器的反代地址，目前是通过覆盖api.py实现，但是会由于更新产生变动</issue_description>

<agent_instructions>适配一下，要求可以在适配器配置里填写，底层传给libs/ 里的api，做好对旧版的兼容性，写好默认值；</agent_instructions>

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

@RockChinQ 欢迎pr，这个你可以直接让 @copilot 来写，然后你review一下就好

• Fixes [Feature]: 期望支持配置企微api地址 #1830

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