docs: add FAQ/security/changelog

docs/FAQ.md

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+# OCM FAQ
+
+## Q: Telegram 群里经常显示 typing，但不回消息？
+
+Most common cause is **BotFather Group Privacy** being ON.
+
+Fix:
+- BotFather → Your bot → Bot Settings → **Group Privacy** → **Turn off**
+
+Also check:
+- `openclaw status` (gateway healthy?)
+- provider auth/rate limits (OCM → Auth page, and gateway logs)
+
+## Q: 如何获取 Telegram Group ID（Peer ID / -100...）？
+
+Typical workflow:
+
+```bash
+openclaw gateway logs --follow
+```
+
+Send a message in the target group; the gateway logs usually contain the peer id.
+
+## Q: 模型下拉列表为什么没有我想要的模型？
+
+OCM sources model options from the real CLI output:
+
+```bash
+openclaw models list
+```
+
+So if it doesn't show up in OCM, make sure it's registered/available in your OpenClaw environment.
+
+## Q: Dashboard 里 Gateway HTTP Ping 显示 Unreachable？
+
+Common reasons:
+- Gateway not running
+- Gateway binds to a different interface/port than OCM expects
+- Local firewall/proxy interference
+
+Try:
+- `openclaw status`
+- `openclaw gateway restart`
+
+## Q: OCM 会把我的 token/个人信息上传出去吗？
+
+OCM is designed as a **local** dashboard.
+
+That said, your local OpenClaw config contains sensitive information. Follow the safety guidance:
+- keep agent Telegram groups private
+- don't share raw screenshots without redaction
+
+See: `docs/SECURITY.md`.