refactor: migrate container registry from 80.71.235.15:3000 to git.tx1138.com/lfg2025

All hardcoded references to the old IP-based registry replaced across
Rust backend, Vue frontend, shell scripts, Dockerfiles, CI, and docs.

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

scripts/deploy-bitcoin-knots.sh

@@ -74,7 +74,7 @@ mkdir -p "$BUILD_DIR"
 
 # Create Dockerfile
 cat > "$BUILD_DIR/Dockerfile" << 'EOF'
-FROM ${NGINX_ALPINE_IMAGE:-80.71.235.15:3000/archipelago/nginx:1.29.6-alpine}
+FROM ${NGINX_ALPINE_IMAGE:-git.tx1138.com/lfg2025/nginx:1.29.6-alpine}
 
 # Copy the static UI
 COPY index.html /usr/share/nginx/html/