feat(infra): Docker Compose dev environment auto-reload file watcher (Closes #1366)

[camesenin]

Summary

Resolves #1366

Configures native Docker Compose file watching (develop.watch) across the repository, enabling real-time file synchronization and Hot Module Replacement (HMR) in local containerized development environments without requiring container restarts or manual rebuilds.

Changes

1. compose.yaml:
   • Configured develop.watch on backend with sync action on ./backend/src -> /app/backend/src and rebuild on ./backend/package.json.
   • Configured develop.watch on frontend with sync action on ./frontend/src -> /app/frontend/src and ./frontend/public -> /app/frontend/public, and rebuild on ./frontend/package.json.
   • Set CHOKIDAR_USEPOLLING: "true" on the frontend service.
2. frontend/vite.config.js:
   • Added watch: { usePolling: process.env.CHOKIDAR_USEPOLLING === 'true' } to server block to support reliable file events across Windows/WSL2 and macOS mounts.
3. Makefile & package.json:
   • Added dev-watch target in Makefile (docker compose watch).
   • Added "dev:watch": "docker compose watch" in root package.json.
4. Documentation:
   • Added comprehensive guide docs/DOCKER_COMPOSE_WATCH.md detailing architecture, file sync mappings, commands, and cross-platform polling setup.
   • Updated docs/DEVELOPMENT.md with quick-start watch instructions.
5. Testing:
   • Added unit test suite backend/tests/composeWatch.test.js validating YAML structure, develop.watch specs, and polling variables.

Verification

• Ran node --test tests/composeWatch.test.js passing 4/4 tests cleanly.
• Verified Prettier code formatting on all modified files (npx prettier --check).

[camesenin]

Hi @Gbangbolaoluwagbemiga @joelpeace48-cell, this PR is ready for review with all tests passing. Could you please assign me to this issue on Drips Wave (@camesenin) so that it is properly tracked for Wave 9 before merging? Thank you!