feat: streaming ecash payments + media playback overhaul

Cashu ecash protocol (BDHKE blind signatures, cashuA token format,
mint HTTP client) replacing the stub wallet. TollGate-inspired streaming
data payment system with step-based pricing (bytes/time/requests),
session management with incremental top-ups, usage metering, and
Nostr kind 10021 service advertisements.

13 new streaming.* RPC endpoints. Content server now verifies real
Cashu tokens. Profits tracking includes streaming revenue.

Frontend: GlobalAudioPlayer (persistent bottom bar across all pages),
video lightbox with full controls, audio in MediaLightbox, free file
previews (no blur), paid 10% audio/video previews, separated play
vs download buttons in PeerFiles.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/deploy-to-target.sh

@@ -1730,6 +1730,9 @@ LNDCONF
           echo "   Removed X-Frame-Options from IndeedHub"
         fi
 
+        # Fix Host header for NIP-98 auth — $host strips port, $http_host preserves it
+        podman exec indeedhub sh -c "sed -i '"'"'s/proxy_set_header Host \$host;/proxy_set_header Host \$http_host;/g'"'"' /etc/nginx/conf.d/default.conf" 2>/dev/null && CHANGED=true && echo "   Fixed Host header for NIP-98 auth" || true
+
         # Inject nostr-provider.js for NIP-07 signing
         if ! podman exec indeedhub test -f /usr/share/nginx/html/nostr-provider.js 2>/dev/null; then
           podman cp /opt/archipelago/web-ui/nostr-provider.js indeedhub:/usr/share/nginx/html/nostr-provider.js 2>/dev/null