feat: v1.2.0-alpha — E2E encrypted mesh relay, steganography, relay status polling

Phase 5 mesh networking:
- E2E encrypted TX relay (X25519 + ChaCha20-Poly1305) — non-Archy nodes
  relay encrypted blobs transparently via Meshcore native routing
- Steganographic encoding modes (WeatherStation, SensorNetwork) — traffic
  looks like sensor data on the wire, 0xAA marker, configurable per-node
- Pre-flight Bitcoin Core health check on relay node — specific error codes
  (bitcoin_unreachable, bitcoin_syncing, tx_rejected) instead of generic fails
- mesh.relay-status RPC endpoint — frontend polls for relay result every 3s
- On-Chain / Lightning tabs in Off-Grid Bitcoin panel
- Archy Peers vs Mesh Broadcast relay mode selector
- Mesh view fills viewport (no page scroll), internal panel scrolling
- Version bump to 1.2.0-alpha

Also includes: deploy hardening, container fixes, IndeedHub updates,
boot screen, dashboard improvements, MASTER_PLAN task tracking

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

neode-ui/src/views/Marketplace.vue

@@ -79,6 +79,7 @@
         <div class="mode-switcher flex-shrink-0">
           <RouterLink to="/dashboard/apps" class="mode-switcher-btn">My Apps</RouterLink>
           <RouterLink to="/dashboard/marketplace" class="mode-switcher-btn mode-switcher-btn-active">App Store</RouterLink>
+          <RouterLink to="/dashboard/apps?tab=services" class="mode-switcher-btn">Services</RouterLink>
         </div>
         <div class="mode-switcher flex-shrink-0">
           <button
@@ -101,7 +102,7 @@
         />
       </div>
 
-      <!-- Mobile: Search only (categories handled by floating filter modal) -->
+      <!-- Mobile: search (tabs handled by Dashboard.vue header) -->
       <div class="md:hidden mb-4">
         <input
           v-model="searchQuery"