ci: use pnpm/action-setup and sync README install steps (#2512)

* ci(workflows): use pnpm/action-setup in build and release pipelines

Replace the corepack-based pnpm setup with pnpm/action-setup
and pin pnpm to v10.33.0 in the create_dmg, nightly, and
release GitHub Actions workflows.

* docs(readme): update pnpm setup instructions across translated READMEs

.github/workflows/release.yml

@@ -65,6 +65,12 @@ jobs:
         with:
           go-version-file: go.mod
 
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10.33.0
+          run_install: false
+
       - name: Setup Node.js
         uses: actions/setup-node@v6
         with:
@@ -72,9 +78,6 @@ jobs:
           cache: pnpm
           cache-dependency-path: web/frontend/pnpm-lock.yaml
 
-      - name: Setup pnpm
-        run: corepack enable && corepack install
-
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v4