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/package.json

@@ -1,7 +1,7 @@
 {
   "name": "neode-ui",
   "private": true,
-  "version": "1.1.0",
+  "version": "1.2.0-alpha",
   "type": "module",
   "scripts": {
     "start": "./start-dev.sh",
@@ -10,6 +10,7 @@
     "test:watch": "vitest",
     "dev": "vite",
     "dev:mock": "concurrently \"node mock-backend.js\" \"VITE_AIUI_URL=http://localhost:5173 vite\" \"cd ../../AIUI && pnpm dev 2>/dev/null || echo '[AIUI] Not found at ../../AIUI — chat will show placeholder'\"",
+    "dev:boot": "VITE_DEV_MODE=boot concurrently \"VITE_DEV_MODE=boot node mock-backend.js\" \"VITE_DEV_MODE=boot vite\"",
     "dev:real": "echo 'Start backend: cd ../core && cargo run --release' && vite",
     "backend:mock": "node mock-backend.js",
     "backend:real": "cd ../core && cargo run --release",