fix: Regenerate package-lock.json to remove corrupted npm registry URLs

The workspace package-lock.json had corrupted 'resolved' URLs for many packages
including string_decoder, causing Docker builds to fail with 404 errors.

Changes:
- Regenerated root package-lock.json which manages all workspace dependencies
- Restored npm ci in Dockerfile (now that lockfile is fixed)
- Keep PRISMA_CLI_BINARY_TYPE=binary for ARM64 compatibility

This should resolve both AMD64 and ARM64 Docker build failures.

docker/backend.Dockerfile

@@ -47,9 +47,9 @@ COPY --chown=node:node backend/ ./backend/
 WORKDIR /app/backend
 
 RUN npm cache clean --force &&\
-    rm -rf node_modules ~/.npm /root/.npm package-lock.json &&\
-    npm install --omit=dev --ignore-scripts --legacy-peer-deps --no-audit --prefer-online --fetch-retries=0 &&\
-    npm run db:generate &&\
+    rm -rf node_modules ~/.npm /root/.npm &&\
+    npm ci --ignore-scripts --legacy-peer-deps --no-audit --prefer-online --fetch-retries=0 &&\
+    PRISMA_CLI_BINARY_TYPE=binary npm run db:generate &&\
     npm prune --omit=dev &&\
     npm cache clean --force