fix(ci): use Node.js tarball instead of fnm (runner lacks unzip)

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

.gitea/workflows/publish.yml

@@ -12,18 +12,13 @@ jobs:
 
       - name: Install Node.js
         run: |
-          curl -fsSL https://fnm.vercel.app/install | bash -s -- --skip-shell
-          export PATH="$HOME/.local/share/fnm:$PATH"
-          eval "$(fnm env)"
-          fnm install --lts
-          fnm use --lts
+          NODE_VERSION=22.17.0
+          curl -fsSL "https://nodejs.org/dist/v${NODE_VERSION}/node-v${NODE_VERSION}-linux-x64.tar.xz" | tar -xJ --strip-components=1 -C /usr/local
           node --version
           npm --version
 
       - name: Build frontend
         run: |
-          export PATH="$HOME/.local/share/fnm:$PATH"
-          eval "$(fnm env)"
           cd crates/ericrfb-frontend
           npm ci
           npm run build