feat: add daemon service management

docs/platforms/index.md

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+---
+summary: "Platform support overview (Gateway + companion apps)"
+read_when:
+  - Looking for OS support or install paths
+  - Deciding where to run the Gateway
+---
+# Platforms
+
+Clawdbot core is written in TypeScript, so the CLI + Gateway run anywhere Node or Bun runs.
+
+Companion apps exist for macOS (menu bar app) and mobile nodes (iOS/Android). Windows and
+Linux companion apps are planned, but the core Gateway is fully supported today.
+
+## Choose your OS
+
+- macOS: [macOS](/platforms/macos)
+- iOS: [iOS](/platforms/ios)
+- Android: [Android](/platforms/android)
+- Windows: [Windows](/platforms/windows)
+- Linux: [Linux](/platforms/linux)
+
+## Common links
+
+- Install guide: [Getting Started](/start/getting-started)
+- Gateway runbook: [Gateway](/gateway)
+- Gateway configuration: [Configuration](/gateway/configuration)
+- Service status: `clawdbot daemon status`
+
+## Gateway service install (CLI)
+
+Use one of these (all supported):
+
+- Wizard (recommended): `clawdbot onboard --install-daemon`
+- Direct: `clawdbot daemon install` (alias: `clawdbot gateway install`)
+- Configure flow: `clawdbot configure` → select **Gateway daemon**
+- Repair/migrate: `clawdbot doctor` (offers to install or fix the service)
+
+The service target depends on OS:
+- macOS: LaunchAgent (`com.clawdbot.gateway`)
+- Linux/WSL2: systemd user service