docs: comprehensive documentation update for recent features
New documentation:
- DingTalk messaging platform setup guide (dingtalk.md)
Updated existing docs:
- quickstart.md: add Alibaba Cloud, Kilo Code, Vercel AI Gateway to provider table
- configuration.md: add Alibaba Cloud provider, website blocklist config,
light/dark theme mode, smart approvals (ask/smart/off)
- environment-variables.md: add Mattermost, Matrix, DingTalk, Browser Use,
DashScope env vars
- browser.md: add Browser Use cloud provider, /browser connect CDP mode,
multi-provider architecture, fix limitation section contradiction
- slash-commands.md: add /tools enable/disable/list, /browser connect/disconnect/status
- messaging/index.md: add DingTalk, Mattermost, Matrix to architecture diagram,
platform toolset table, security allowlists, and Next Steps links
- security.md: add website access policy (blocklist) documentation
- sidebars.ts: add Mattermost, Matrix, DingTalk to Messaging Gateway sidebar
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