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>

neode-ui/src/views/MarketplaceAppDetails.vue

@@ -445,12 +445,12 @@ const features = computed(() => {
 
 /** App dependency definitions */
 const APP_DEPENDENCIES: Record<string, { id: string; title: string; dockerImage: string }[]> = {
-  'electrs': [{ id: 'bitcoin-knots', title: 'Bitcoin Knots', dockerImage: 'docker.io/bitcoinknots/bitcoin:latest' }],
+  'electrumx': [{ id: 'bitcoin-knots', title: 'Bitcoin Knots', dockerImage: 'docker.io/bitcoinknots/bitcoin:latest' }],
   'lnd': [{ id: 'bitcoin-knots', title: 'Bitcoin Knots', dockerImage: 'docker.io/bitcoinknots/bitcoin:latest' }],
   'btcpay-server': [{ id: 'bitcoin-knots', title: 'Bitcoin Knots', dockerImage: 'docker.io/bitcoinknots/bitcoin:latest' }],
   'mempool': [
     { id: 'bitcoin-knots', title: 'Bitcoin Knots', dockerImage: 'docker.io/bitcoinknots/bitcoin:latest' },
-    { id: 'electrs', title: 'Electrs', dockerImage: 'docker.io/mempool/electrs:latest' },
+    { id: 'electrumx', title: 'ElectrumX', dockerImage: 'docker.io/lukechilds/electrumx:v1.18.0' },
   ],
   'fedimint': [{ id: 'bitcoin-knots', title: 'Bitcoin Knots', dockerImage: 'docker.io/bitcoinknots/bitcoin:latest' }],
 }
@@ -533,7 +533,7 @@ async function installDependencies() {
   installError.value = null
 
   try {
-    // Install dependencies sequentially (order matters: bitcoin before electrs)
+    // Install dependencies sequentially (order matters: bitcoin before electrumx)
     for (const dep of missingDeps) {
       await rpcClient.call({
         method: 'package.install',