chore: release v1.7.47-alpha

Sync-perf tuning for bitcoin/bitcoin-core/bitcoin-knots/electrumx.

- Drop the --cpus=2 cap on bitcoin/electrumx variants. Script verification
  is parallelizable; the cap halved IBD speed on 4-8 core machines.
- Bump bitcoin --memory 4g→8g so dbcache=4096 has headroom for mempool +
  connection buffers + I/O. 4g was OOM-prone during heavy IBD.
- Bump electrumx --memory 1g→2g + add CACHE_MB=2048 + MAX_SEND=10MB.
- bitcoin-core CLI args gain -dbcache=4096 -par=0 -maxconnections=125.
- bitcoin-knots manifest matched (1024MB pruned / 4096MB full + par=0).

Future v2: host-RAM-aware dbcache scaling.

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

neode-ui/package.json

@@ -1,7 +1,7 @@
 {
   "name": "neode-ui",
   "private": true,
-  "version": "1.7.46-alpha",
+  "version": "1.7.47-alpha",
   "type": "module",
   "scripts": {
     "start": "./start-dev.sh",