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/styles/global.css

@@ -169,6 +169,12 @@ input::placeholder { color: var(--text-disabled); }
   color: var(--text-disabled);
 }
 .statusbar-left, .statusbar-right { display: flex; align-items: center; gap: 12px; }
+.statusbar-sudo {
+  font-size: 10px; font-weight: 700; font-family: var(--font-mono);
+  padding: 1px 6px; border-radius: 3px;
+  background: rgba(239, 68, 68, 0.15); color: #ef4444; border: 1px solid rgba(239, 68, 68, 0.3);
+  text-transform: uppercase; letter-spacing: 0.5px;
+}
 .statusbar-shortcut { display: inline-flex; align-items: center; gap: 4px; }
 .statusbar-shortcut kbd {
   display: inline-block; padding: 1px 5px; border-radius: 3px;
@@ -637,6 +643,14 @@ input::placeholder { color: var(--text-disabled); }
 
 .dash-empty { font-size: 11px; color: var(--text-disabled); }
 
+/* Graph */
+.dash-graph-wrap { display: flex; flex-direction: column; gap: 2px; }
+.dash-graph-header { display: flex; justify-content: space-between; align-items: center; }
+.dash-graph-label { font-size: 9px; color: var(--text-disabled); text-transform: uppercase; }
+.dash-graph-value { font-size: 10px; font-family: var(--font-mono); font-weight: 600; }
+.dash-graph-svg { width: 100%; height: 32px; }
+.dash-graph-empty { font-size: 10px; color: var(--text-disabled); text-align: center; padding: 8px 0; }
+
 /* Legacy dashboard kept for reference */
 .dashboard-layout { display: flex; flex-direction: column; height: 100%; }
 .dashboard-content { flex: 1; overflow-y: auto; }