Add database seeders to startup script

Fix migration timing - run migrations at startup instead of build time

Add database migrations to build process

Fix Docker build - add .env.example to repository and update .dockerignore

Fix Dockerfile - create .env file and use PORT variable

Add Dockerfile and buildpacks.txt for reliable Railway deployment

Simplify build configuration - remove Dockerfile and nixpacks.toml

Fix health check - add /health endpoint and increase timeout

Fix Railway deployment - remove shell script, use direct PHP command

Fix Railway deployment - use PHP built-in server

Add Railway deployment configuration

Initial commit - Laravel SkillsXchange project with admin dashboard