fix: ISO boot, container installs, VPN, nginx, companion input

- LUKS auto-unlock: initramfs hook + systemd service + nofail fstab
- Rootfs packages: add passt, aardvark-dns, netavark, nftables for Podman 5.x
- nginx: resolver + variable proxy_pass for external domains (DNS at boot)
- Boot: loglevel=0 suppresses kernel warnings, serial console for QEMU
- Container installs: write configs before chown, sudo chown for LUKS volumes
- Container installs: build UI sidecars locally (not from registry) for auth injection
- Bitcoin UI: inject RPC auth from secrets file, --no-cache rebuild
- Secrets: chown to archipelago user in first-boot (backend needs read access)
- Podman: image_copy_tmp_dir for read-only /var/tmp in user namespace
- NostrVPN: enable service in auto-install, always include public relays
- NostrVPN: read tunnel IP from nvpn status (not just config file)
- VPN invite: v2 base64 no-pad format matching phone app
- Companion input: relay always active, kiosk skips relay listener (prevents double input)
- dev-start.sh: production build includes AIUI deployment

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

core/archipelago/src/api/handler/remote_input.rs

@@ -185,7 +185,7 @@ impl ApiHandler {
                                         continue; // silently drop
                                     }
 
-                                    // Relay to connected browsers (best-effort, ignore if no receivers)
+                                    // Always relay to browser clients (remote browser sessions)
                                     let _ = relay_tx.send(text.clone());
 
                                     match handle_input(&text).await {