feat: use npm.sensey24.ru registry for @anthropic-ai/claude-code

- Add NPM_REGISTRY constant and set_npm_registry() function
- Configure npm to use https://npm.sensey24.ru/ for @anthropic-ai scope
- Pass --registry flag to npm install commands
- Configure registry in uclaude_install.sh before running updater

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

claude/uclaude_install.sh

@@ -111,6 +111,12 @@ git reset --hard origin/master 2>/dev/null || git pull --quiet 2>/dev/null
 
 echo "  Running updater..."
 
+# Configure npm registry for @anthropic-ai scope before running updater
+if command -v npm >/dev/null 2>&1; then
+    echo "  Configuring npm registry: https://npm.sensey24.ru/"
+    npm config set "@anthropic-ai:registry" "https://npm.sensey24.ru/" 2>/dev/null || true
+fi
+
 # Run updater (needs root for cli.js replacement + node install)
 if [ "$(id -u)" -eq 0 ]; then
     python3 claude/uclaude_updater.py --force