feat: Add Docker support with multi-stage build and nginx

[ianalloway]

Summary

Adds Docker containerization for the AI Advantage Sports app with a multi-stage build process. The production image uses nginx to serve the built static assets, while a separate dev profile enables hot-reload development in containers.

Files added:

• Dockerfile - Multi-stage build (Node 20 Alpine → nginx Alpine)
• docker-compose.yml - Production service on port 3000, dev service on port 5173
• nginx.conf - SPA routing, gzip compression, static asset caching
• .dockerignore - Excludes node_modules, dist, env files, etc.

Review & Testing Checklist for Human

• Build and run the Docker image locally: docker compose up --build
• Verify SPA routing works (navigate to a route, refresh the page - should not 404)
• Check if any environment variables are needed at runtime (currently only NODE_ENV is set)
• Confirm port 3000 doesn't conflict with other local services

Recommended test plan:

docker compose up --build
# Visit http://localhost:3000
# Navigate around the app, refresh on different routes
# Check browser console for any errors

Notes

The dev service uses Docker profiles - run with docker compose --profile dev up for hot-reload development. The production build assumes Vite outputs to dist/ which is the default.

Link to Devin run: https://app.devin.ai/sessions/79b2218c13784145ac50150fb81d91c1
Requested by: Ian Alloway

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