release(v1.7.36-alpha): bitcoin-core in App Store + Sovereignty Stack + dynamic catalog URL

- neode-ui/public/assets/img/app-icons/bitcoin-core.svg (NEW): 256×256
  Umbrel community Bitcoin icon sourced from getumbrel.github.io/
  umbrel-apps-gallery/bitcoin/icon.svg. Referenced by the static
  catalog, the curated fallback, and the upstream lfg2025/app-catalog
  entry so every surface shows the same image.
- app-catalog/catalog.json + neode-ui/public/catalog.json: add
  bitcoin-core (v28.4) entry pointing at bitcoin/bitcoin:28.4. Same
  entry pushed to the lfg2025/app-catalog repo on .160 and the local
  gitea mirror so nodes see it without needing a full archipelago
  update. Sovereignty Stack entry added to FEATURED_DEFINITIONS with
  a description that frames it as a Knots alternative, not a rival.
- core/archipelago/src/api/handler/mod.rs: handle_app_catalog_proxy
  is now instance-scoped (&self) and derives its upstream list from
  load_registries — each active container registry contributes one
  `<scheme>://<reg.url>/app-catalog/raw/branch/main/catalog.json` URL
  in priority order (scheme follows tls_verify). When the operator
  switches mirrors in Settings, the App Store now follows. Falls back
  to the legacy hardcoded .160/tx1138 pair only when registry config
  can't be loaded, so the App Store still renders on nodes that
  haven't persisted one yet.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

neode-ui/src/views/discover/curatedApps.ts

@@ -77,6 +77,7 @@ export async function fetchAppCatalog(): Promise<AppCatalog | null> {
 export function getCuratedAppList(): MarketplaceApp[] {
   return [
     { id: 'bitcoin-knots', title: 'Bitcoin Knots', version: '28.1.0', description: 'Run a full Bitcoin node. Validate and relay blocks and transactions on the Bitcoin network.', icon: '/assets/img/app-icons/bitcoin-knots.webp', author: 'Bitcoin Knots', dockerImage: `${R}/bitcoin-knots:latest`, repoUrl: 'https://github.com/bitcoinknots/bitcoin' },
+    { id: 'bitcoin-core', title: 'Bitcoin Core', version: '28.4', description: 'Reference implementation of the Bitcoin protocol. Run a full node validating and relaying blocks on the Bitcoin network.', icon: '/assets/img/app-icons/bitcoin-core.svg', author: 'Bitcoin Core contributors', dockerImage: 'bitcoin/bitcoin:28.4', repoUrl: 'https://github.com/bitcoin/bitcoin' },
     { id: 'btcpay-server', title: 'BTCPay Server', version: '1.13.7', description: 'Self-hosted Bitcoin payment processor. Accept Bitcoin payments without intermediaries or fees.', icon: '/assets/img/app-icons/btcpay-server.png', author: 'BTCPay Server Foundation', dockerImage: `${R}/btcpayserver:1.13.7`, repoUrl: 'https://github.com/btcpayserver/btcpayserver' },
     { id: 'lnd', title: 'LND', version: '0.18.4', description: 'Lightning Network Daemon. Fast and cheap Bitcoin payments through the Lightning Network.', icon: '/assets/img/app-icons/lnd.svg', author: 'Lightning Labs', dockerImage: `${R}/lnd:v0.18.4-beta`, repoUrl: 'https://github.com/lightningnetwork/lnd' },
     { id: 'mempool', title: 'Mempool Explorer', version: '3.0.0', description: 'Self-hosted Bitcoin blockchain and mempool visualizer. Monitor transactions without revealing your addresses to third parties.', icon: '/assets/img/app-icons/mempool.webp', author: 'Mempool', dockerImage: `${R}/mempool-frontend:v3.0.0`, repoUrl: 'https://github.com/mempool/mempool' },
@@ -164,6 +165,11 @@ export const FEATURED_DEFINITIONS: {
     desc: 'The foundation of sovereignty. Run a full Bitcoin node to validate every transaction yourself. No trusted third parties. No asking permission. Your node enforces the consensus rules that protect your wealth. Don\'t trust — verify.',
     tag: 'FULL VALIDATION // ZERO TRUST',
   },
+  {
+    id: 'bitcoin-core',
+    desc: 'The reference Bitcoin implementation. Same full-node guarantees as Knots, tracking upstream releases from the Bitcoin Core maintainers. Pick this if you\'d rather run mainline Bitcoin Core than Knots — both validate every block themselves.',
+    tag: 'REFERENCE CLIENT // ZERO TRUST',
+  },
   {
     id: 'lnd',
     desc: 'Lightning-fast payments over the Lightning Network. Open channels, route transactions, and earn routing fees — all from your sovereign node. Instant settlement. Near-zero fees. The future of money, running on your hardware.',