fix: Web standalone — set outputFileTracingRoot to repo root

In monorepo, Next.js standalone creates symlinks instead of real files.
Setting outputFileTracingRoot to repo root produces self-contained output.
Dockerfile updated to copy from correct standalone structure.

Co-Authored-By: Claude Opus 4 (1M context) <noreply@anthropic.com>

apps/web/Dockerfile

@@ -28,10 +28,14 @@ ENV HOSTNAME=0.0.0.0
 ENV PORT=3000
 
 # Copy Next.js standalone output
-# In monorepo with `cd apps/web && next build`, standalone contains:
-# .next/standalone/ → root with server.js + node_modules/ + package.json
-RUN mkdir -p ./public
-COPY --from=build --chown=node:node /app/apps/web/.next/standalone ./
+# With outputFileTracingRoot=repo_root, standalone structure is:
+# .next/standalone/node_modules/    → real deps (not symlinks)
+# .next/standalone/apps/web/        → server.js, .next/, package.json
+RUN mkdir -p ./public ./.next/static
+COPY --from=build --chown=node:node /app/apps/web/.next/standalone/node_modules ./node_modules
+COPY --from=build --chown=node:node /app/apps/web/.next/standalone/apps/web/server.js ./server.js
+COPY --from=build --chown=node:node /app/apps/web/.next/standalone/apps/web/package.json ./package.json
+COPY --from=build --chown=node:node /app/apps/web/.next/standalone/apps/web/.next ./.next
 COPY --from=build --chown=node:node /app/apps/web/.next/static ./.next/static
 # Copy public assets if any exist (may be empty)
 COPY --from=build --chown=node:node /app/apps/web/public ./public

apps/web/next.config.js

@@ -7,6 +7,8 @@ const withNextIntl = createNextIntlPlugin('./i18n/request.ts');
 const nextConfig = {
   reactStrictMode: true,
   output: 'standalone',
+  // In monorepo, trace from repo root so standalone output includes all deps
+  outputFileTracingRoot: require('path').join(__dirname, '../../'),
   images: {
     remotePatterns: [
       {