perf: bundle server with bun build to eliminate node_modules in production

Dockerfile

@@ -15,15 +15,16 @@ ENV PUBLIC_API_URL=$PUBLIC_API_URL
 
 RUN bun run build:server
 
+# Bundle the server into a single file with all dependencies
+RUN bun build build/index.js --target node --outdir build-bundled --minify
+
 # Production image
 FROM node:22-alpine AS production
 
 WORKDIR /app
 
-COPY --from=base /app/build ./build
-COPY --from=base /app/package.json ./
-
-RUN npm install --omit=dev
+COPY --from=base /app/build-bundled/index.js ./index.js
+COPY --from=base /app/build/client ./client
 
 ENV NODE_ENV=production
 ENV PORT=3000
@@ -31,4 +32,4 @@ ENV ORIGIN=https://optima.osdci.net
 
 EXPOSE 3000
 
-CMD ["node", "build/index.js"]
+CMD ["node", "index.js"]