fix(release): copy site/ for go:embed before binary build

release.yml only copied dist/; site_embed.go also embeds site/.
Mirror build:all so the cross-compiled binary embeds the landing+docs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: imranparuk

.github/workflows/release.yml

@@ -81,6 +81,8 @@ jobs:
         run: |
           mkdir -p backend/cmd/wede/dist
           cp -r dist/* backend/cmd/wede/dist/
+          mkdir -p backend/cmd/wede/site
+          cp -r site/* backend/cmd/wede/site/
 
           VERSION="${GITHUB_REF_NAME}"
           EXT=""
@@ -91,7 +93,7 @@ jobs:
             -ldflags "-s -w -X main.Version=${VERSION}" \
             -o "wede-${GOOS}-${GOARCH}${EXT}" ./backend/cmd/wede
 
-          rm -rf backend/cmd/wede/dist
+          rm -rf backend/cmd/wede/dist backend/cmd/wede/site
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4