Copy package.json into Docker runtime image so APP_VERSION reads correctly; v1.1.27

package.json was missing from the runtime stage, causing readPackageVersion()
to throw and fall back to 'unknown'. The git commit hash (from COMMIT_SHA env)
was the only identifier shown.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -16,6 +16,7 @@ ENV COMMIT_SHA=${COMMIT_SHA}
 
 COPY --from=deps /app/node_modules ./node_modules
 
+COPY package.json ./package.json
 COPY dist ./dist
 COPY server.js ./server.js
 COPY server/ ./server/