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/OnboardingDid.vue

@@ -42,8 +42,7 @@
                 </svg>
               </div>
             </div>
-            <p v-if="autoAdvancing" class="text-lg text-white/80 mb-2">DID retrieved, continuing...</p>
-            <p v-else class="text-[20px] text-white/80 leading-relaxed max-w-[600px] mx-auto mb-6">
+            <p class="text-[20px] text-white/80 leading-relaxed max-w-[600px] mx-auto mb-6">
               Your node's decentralized identifier
             </p>
           </div>
@@ -128,10 +127,8 @@ const generatedDid = ref<string>('')
 const nostrNpub = ref<string>('')
 const isGenerating = ref(false)
 const waitingForServer = ref(false)
-const autoAdvancing = ref(false)
 const didCopied = ref(false)
 const npubCopied = ref(false)
-const elapsedSeconds = ref(0)
 const elapsedDisplay = ref('0:00')
 let retryTimer: ReturnType<typeof setTimeout> | null = null
 let elapsedTimer: ReturnType<typeof setInterval> | null = null
@@ -141,7 +138,6 @@ function startElapsedTimer() {
   startTime = Date.now()
   elapsedTimer = setInterval(() => {
     const secs = Math.floor((Date.now() - startTime) / 1000)
-    elapsedSeconds.value = secs
     const m = Math.floor(secs / 60)
     const s = secs % 60
     elapsedDisplay.value = `${m}:${s.toString().padStart(2, '0')}`
@@ -179,7 +175,6 @@ async function fetchDid() {
       }
     }).catch(() => { /* Nostr key may not exist yet */ })
 
-    autoAdvanceAfterDelay()
   } catch {
     isGenerating.value = false
     if (!waitingForServer.value) {
@@ -190,13 +185,6 @@ async function fetchDid() {
   }
 }
 
-function autoAdvanceAfterDelay() {
-  autoAdvancing.value = true
-  setTimeout(() => {
-    router.push('/onboarding/identity').catch(() => {})
-  }, 2000)
-}
-
 onMounted(() => {
   const cached = localStorage.getItem('neode_did')
   const cachedNpub = localStorage.getItem('neode_nostr_npub')