feat: add daemon service management

docs/platforms/linux.md

@@ -1,11 +1,80 @@
 ---
-summary: "Linux app status + contribution call"
+summary: "Linux support + companion app status"
 read_when:
   - Looking for Linux companion app status
   - Planning platform coverage or contributions
 ---
 # Linux App
 
-Clawdbot core is fully supported on Linux. The core is written in TypeScript, so it runs anywhere Node runs.
+Clawdbot core is fully supported on Linux. The core is written in TypeScript, so it runs anywhere Node or Bun runs.
 
 We do not have a Linux companion app yet. It is planned, and we would love contributions to make it happen.
+
+## Install
+- [Getting Started](/start/getting-started)
+- [Install & updates](/install/updating)
+- Optional flows: [Bun](/install/bun), [Nix](/install/nix), [Docker](/install/docker)
+
+## Gateway
+- [Gateway runbook](/gateway)
+- [Configuration](/gateway/configuration)
+
+## Gateway service install (CLI)
+
+Use one of these:
+
+```
+clawdbot onboard --install-daemon
+```
+
+Or:
+
+```
+clawdbot daemon install
+```
+
+Or:
+
+```
+clawdbot gateway install
+```
+
+Or:
+
+```
+clawdbot configure
+```
+
+Select **Gateway daemon** when prompted.
+
+Repair/migrate:
+
+```
+clawdbot doctor
+```
+
+## System control (systemd user unit)
+Full unit example lives in the [Gateway runbook](/gateway). Minimal setup:
+
+Create `~/.config/systemd/user/clawdbot-gateway.service`:
+
+```
+[Unit]
+Description=Clawdbot Gateway
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+ExecStart=/usr/local/bin/clawdbot gateway --port 18789
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=default.target
+```
+
+Enable it:
+
+```
+systemctl --user enable --now clawdbot-gateway.service
+```