Fix Docker build and production server infrastructure

- Add SKIP_ENV_VALIDATION to bypass Zod env check during next build
- Bundle custom server.ts with esbuild so production uses Socket.io
- Create worker entry point (src/worker.ts) with all BullMQ workers
- Add esbuild build scripts for server and worker bundles
- Fix Dockerfile.worker to include its own build stage
- Fix pre-commit hook to work without global pnpm
- Add CLAUDE.md with project conventions and quick reference

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -11,6 +11,7 @@ drizzle/*.sql
 coverage/
 .turbo/
 out/
+dist/
 test-results/
 playwright-report/
 nginx/certs/