Improve local dev setup (asdf tool versions, docker compose, seed data)

[boomNDS]

I use this app with my friend and it’s great for planning; this PR improves local development to help us keep building features.

Summary

• Add .tool-versions (Go 1.20.14, Node 20.20.2) for consistent local tooling with asdf.
• Introduce docker-compose.yml for easy local spin-up (Mongo + Go API + Vue dev server) with a hybrid Mongo-only option.
• Provide server/.env.example and update the README docs with clearer setup steps, Swagger link, and seed instructions.
• Add server/scripts/seed_demo to create a demo user/event for local testing; note other scripts are one-off migrations.

[maxwellward]

Hi @boomNDS , thanks for your PR. There are now 3 PRs open for better local dev support and docker compose setup, and I believe this one is currently the best candidate for moving forward with.

I plan to properly review this PR when I'm back from my long weekend on the 6th. Before I review it, would you be interested in doing a once over to ensure it's up to date (conflicts currently) and still in a state you're happy with? I only ask since it's been a while since this PR was opened.

Thanks!

[boomNDS]

Hi @maxwellward thanks for the note.

I’ll go through the PR, resolve the conflicts, and make sure it’s up to date before your review it. I’ll also double check that everything still makes sense.

Enjoy your long weekend, and thanks again.