fix(tools): don't use $STD for npm self-update

silent() hard-exits on non-zero rc, so the || fallback never
executes. Use plain redirect instead so npm update failures are
non-fatal as intended.

misc/tools.func

@@ -6246,7 +6246,7 @@ function setup_nodejs() {
     ensure_apt_working || return 1
 
     # Just update npm to latest
-    $STD npm install -g npm@latest 2>/dev/null || true
+    npm install -g npm@latest >/dev/null 2>&1 || true
 
     cache_installed_version "nodejs" "$NODE_VERSION"
     msg_ok "Update Node.js $NODE_VERSION"
@@ -6314,7 +6314,7 @@ function setup_nodejs() {
     local NPM_VERSION
     NPM_VERSION=$(npm -v 2>/dev/null || echo "0")
     if [[ "$NPM_VERSION" != "0" ]]; then
-      $STD npm install -g npm@latest 2>/dev/null || {
+      npm install -g npm@latest >/dev/null 2>&1 || {
         msg_warn "Failed to update npm to latest version (continuing with bundled npm $NPM_VERSION)"
       }
     fi