feat: bitcoin-ui CSS fix, HTTPS proxy support, deploy script improvements

Bitcoin UI:
- Replace cdn.tailwindcss.com with locally bundled tailwind.css (CSP blocks external scripts)
- Make all asset paths relative for nginx proxy compatibility
- Add bitcoin-ui build/deploy to deploy-to-target.sh (was missing entirely)
- Use --network host (bitcoin-ui proxies Bitcoin RPC at 127.0.0.1:8332)

HTTPS mixed content fix:
- Add HTTPS_PROXY_PATHS in AppSession.vue — when parent page is HTTPS,
  iframe loads through nginx proxy instead of direct HTTP port
- Prevents browser blocking HTTP iframes inside HTTPS pages
- All Tailscale servers use HTTPS, this was breaking all app iframes

Deploy & first-boot improvements:
- first-boot-containers.sh auto-detects disk size for pruning vs txindex
- first-boot-containers.sh checks fallback source path for UI containers
- Added mempool-electrs to APP_PORTS mapping
- ElectrumX container creation in first-boot
- Podman doctor/fix/uptime skills added

Also includes: session persistence, identity management, LND transactions,
ElectrumX status UI, nostr-provider improvements, Web5 enhancements

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

core/archipelago/src/health_monitor.rs

@@ -46,7 +46,7 @@ fn container_tier(name: &str) -> StartupTier {
         "bitcoin-knots" | "bitcoin-core" | "bitcoin" => StartupTier::CoreInfra,
 
         // Tier 2: Dependent services
-        "lnd" | "mempool-electrs" | "electrs" | "nbxplorer" => StartupTier::DependentService,
+        "lnd" | "electrumx" | "mempool-electrs" | "electrs" | "nbxplorer" => StartupTier::DependentService,
 
         // Tier 4: Frontend/UI
         "mempool-web" | "bitcoin-ui" | "lnd-ui" | "electrs-ui"