chore: migrate mail themes to shared framework and locked upstream inputs

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: '1.25.x'
 
       - uses: actions/setup-python@v5
         with:
@@ -23,11 +23,17 @@ jobs:
       - name: Test documentation tracker
         run: python -B -m unittest discover -s .github/scripts -p 'test_*.py'
 
-      - name: Test — mail template data contexts
+      - name: Verify pinned official snapshot
+        working-directory: tools
+        run: |
+          go run . upstream prepare
+          go run . upstream verify
+
+      - name: Test — framework alignment and multilingual notification parity
         working-directory: tools
         run: go test ./...
 
-      - name: Lint — render all templates
+      - name: Build and render all themes and official languages
         working-directory: tools
         run: go run . preview all
 
@@ -45,12 +51,16 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: '1.25.x'
 
       - uses: actions/setup-python@v5
         with:
           python-version: '3.11'
 
+      - name: Verify release tag matches the official snapshot
+        run: |
+          python -c 'import json, os; lock=json.load(open("gitea.lock.json")); assert lock["tag"] == os.environ["GITHUB_REF_NAME"], "Release tag must match the pinned Gitea tag"'
+
       - name: Verify release notes
         run: test -s ".github/release-notes/${GITHUB_REF_NAME}.md"
 
@@ -63,18 +73,10 @@ jobs:
         working-directory: tools
         run: go run . preview all
 
-      - name: Package themes/
-        run: |
-          VERSION=${GITHUB_REF#refs/tags/}
-          ARCHIVE="gitea-mail-templates-${VERSION}"
-          mkdir -p "dist/${ARCHIVE}/docs" "dist/${ARCHIVE}/preview"
-          cp -r themes LICENSE README.md CONTRIBUTING.md COMPATIBILITY.md "dist/${ARCHIVE}/"
-          cp docs/README.zh-CN.md docs/CONTRIBUTING.zh-CN.md "dist/${ARCHIVE}/docs/"
-          cp -r docs/images "dist/${ARCHIVE}/docs/"
-          cp preview/index.html preview/rendered.js "dist/${ARCHIVE}/preview/"
-          cd dist
-          zip -r "${ARCHIVE}.zip" "${ARCHIVE}"
-          tar -czf "${ARCHIVE}.tar.gz" "${ARCHIVE}"
+      - name: Package generated installable themes and multilingual preview
+        run: python -B .github/scripts/package_release.py --version "$TEMPLATE_RELEASE"
+        env:
+          TEMPLATE_RELEASE: ${{ github.ref_name }}
 
       - name: Create Release
         uses: softprops/action-gh-release@v3