ci(forgejo): install the .nvmrc Node before npm on the Linux runner

The first real Forgejo CI run failed because the linux-builder runner ships
Node 18.19: scripts using import.meta.dirname threw, and its older npm
reported the mobile lock as out of sync with the file: dependency on
packages/core (the lock is in sync under Node 24's npm).

bootstrap-linux-toolchain.sh gains a checksum-verified `node` mode
(24.19.0, the .nvmrc version); ci.yml (quality, build-validation,
mobile-quality) and deploy-site.yml add it to GITHUB_PATH before npm runs.

scripts/ci/bootstrap-linux-toolchain.sh

@@ -8,7 +8,7 @@ set -euo pipefail
 
 mode="${1:-}"
 if [[ -z "$mode" ]]; then
-  echo 'bootstrap-linux-toolchain: mode is required (dotnet|deno|android)' >&2
+  echo 'bootstrap-linux-toolchain: mode is required (node|dotnet|deno|android)' >&2
   return 64 2>/dev/null || exit 64
 fi
 
@@ -32,6 +32,20 @@ download_verified() {
   esac
 }
 
+# 러너 기본 node(Forgejo linux-builder는 18.x)는 .nvmrc(24.19.0)보다 낮다.
+bootstrap_node() {
+  local node_root="$tools_root/node-v24.19.0-linux-x64"
+  if [[ ! -x "$node_root/bin/node" ]]; then
+    local archive
+    archive="$(mktemp "${TMPDIR:-/tmp}/d3ro-node.XXXXXX.tar.gz")"
+    download_verified       'https://nodejs.org/dist/v24.19.0/node-v24.19.0-linux-x64.tar.gz'       'f625d97cd707df4ff96254916fbc5ff014f09c09effe5a1e0ca8f6d41a8789d4'       "$archive"
+    tar --extract --gzip --file "$archive" --directory "$tools_root"
+    rm -f "$archive"
+  fi
+  export PATH="$node_root/bin:$PATH"
+  [[ "$(node --version)" == "v$(cat .nvmrc)" ]]
+}
+
 bootstrap_dotnet() {
   export DOTNET_ROOT="$tools_root/dotnet-sdk-10.0.302"
   if [[ ! -x "$DOTNET_ROOT/dotnet" ]]; then
@@ -125,6 +139,7 @@ bootstrap_android() {
 }
 
 case "$mode" in
+  node) bootstrap_node ;;
   dotnet) bootstrap_dotnet ;;
   deno) bootstrap_deno ;;
   android) bootstrap_android ;;