docs: add DingTalk setup guide and Alibaba Cloud provider to Docusaurus docs (#1692)
* feat(gateway): wire DingTalk into gateway setup and platform maps
Add DingTalk to:
- hermes_cli/gateway.py: _PLATFORMS list with setup instructions,
AppKey/AppSecret prompts, and Stream Mode setup guide
- gateway/run.py: all platform-to-config-key maps, allowed users
map, allow-all-users map, and toolset resolution maps
* docs: add DingTalk setup guide and Alibaba Cloud provider to docs
- Create website/docs/user-guide/messaging/dingtalk.md with full
setup guide (prerequisites, app creation, config, access control,
features, troubleshooting, env var reference)
- Update messaging/index.md: add DingTalk to diagram, toolsets
table, security examples, and next steps
- Update configuration.md: add Alibaba Cloud to provider table
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