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

website/docs/user-guide/configuration.md

@@ -70,6 +70,7 @@ You need at least one way to connect to an LLM. Use `hermes model` to switch pro
 | **Kimi / Moonshot** | `KIMI_API_KEY` in `~/.hermes/.env` (provider: `kimi-coding`) |
 | **MiniMax** | `MINIMAX_API_KEY` in `~/.hermes/.env` (provider: `minimax`) |
 | **MiniMax China** | `MINIMAX_CN_API_KEY` in `~/.hermes/.env` (provider: `minimax-cn`) |
+| **Alibaba Cloud** | `DASHSCOPE_API_KEY` in `~/.hermes/.env` (provider: `alibaba`, aliases: `dashscope`, `qwen`) |
 | **Kilo Code** | `KILOCODE_API_KEY` in `~/.hermes/.env` (provider: `kilocode`) |
 | **Custom Endpoint** | `hermes model` (saved in `config.yaml`) or `OPENAI_BASE_URL` + `OPENAI_API_KEY` in `~/.hermes/.env` |