feat(dashboard): single-view grid with live CPU/RAM/Net graphs, API quota, processes, and sudo indicator

- Rewrite dashboard from 4 tabs to single grid view with 5s auto-refresh
- Add live CPU/RAM/Network SVG graphs with rolling 30-point history
- Add backend /api/system/metrics reading /proc/stat, /proc/meminfo, /proc/net/dev
- Add backend /api/providers/quota for MiniMax and Z.AI quota monitoring
- Add backend /api/recent-commands reading bash/zsh history
- Add backend /api/running-processes filtering editors/IDEs/languages
- Add sudo/root indicator (⚡ ROOT) in footer when running as root
- Remove duplicate Ctrl+1-4 shortcut from page-specific footer (keep only right side)
- Add Ctrl+R shortcut on dashboard for metrics-only refresh
- Make API key mandatory in onboarding, auto-scan editors via AI chat
- Remove manual editor input, only show AI-detected editors
- Bump version to 0.3.3

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

web/src/api/client.js

@@ -40,6 +40,7 @@ const api = {
   getProvidersQuota: () => request('/providers/quota'),
   getRecentCommands: () => request('/recent-commands'),
   getRunningProcesses: () => request('/running-processes'),
+  getSystemMetrics: () => request('/system/metrics'),
   savePreferences: (prefs) => request('/preferences', { method: 'PUT', body: JSON.stringify(prefs) }),
   saveProfile: (profile) => request('/config/profile', { method: 'PUT', body: JSON.stringify(profile) }),
   saveProvider: (provider) => request('/config/provider', { method: 'PUT', body: JSON.stringify(provider) }),