feat: gateway control panel — start, stop, restart, diagnose

[0xNyk]

Summary

The "Configure Gateway" button in the local mode banner was a dead end — it navigated to a panel that said "requires gateway connection." Now it opens a gateway control panel that works regardless of connection state.

What changed

New POST /api/gateways/control endpoint:

• { gateway: 'hermes', action: 'start' } — runs hermes gateway start
• { gateway: 'hermes', action: 'stop' } — runs hermes gateway stop
• { gateway: 'hermes', action: 'restart' } — runs hermes gateway restart
• { gateway: 'hermes', action: 'diagnose' } — runs hermes doctor
• Same actions for openclaw gateway
• GET returns status of all installed gateways (running/stopped, PID, port)

New GatewayControlPanel component:

• Shows each installed gateway with running status, PID, port
• Start/Stop/Restart buttons with loading states
• Diagnose button runs health checks
• Command output displayed inline
• Graceful handling when no gateways installed

Routing fix:

• gateways panel in local mode now renders GatewayControlPanel instead of "requires gateway" error
• Gateway mode still shows MultiGatewayPanel (unchanged)

Test plan

• pnpm typecheck — passes
• pnpm test — 892/892 pass
• Manual: Click "Configure Gateway" in banner → opens control panel
• Manual: Click "Start" on Hermes gateway → starts gateway process
• Manual: Click "Diagnose" → shows hermes doctor output
• Manual: Click "Stop" → stops gateway, status updates to "Stopped"

[github-actions]

📸 Screenshot Drift Check

This PR modifies UI source files. Please verify whether the README screenshots need refreshing:

• docs/mission-control-overview.png — main dashboard
• docs/mission-control-agents.png — agents panel
• docs/mission-control-memory-graph.png — memory graph

Changed UI files

src/app/[[...panel]]/page.tsx
src/app/api/gateways/control/route.ts
src/components/panels/gateway-control-panel.tsx

See docs/SCREENSHOT-GUIDE.md for instructions on capturing and optimising screenshots.

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