fix: change dotenv config path to use .env file
feat: add usersTable schema for authentication
fix: update seed file to import usersTable from the correct path
feat: add 404 handler for non-existent API routes
feat: implement file upload API with multer
refactor: remove deprecated health check endpoint
feat: add hello endpoint returning static user data
refactor: remove old hello endpoint implementation
feat: add random image selection API with multiple sources
feat: create public file serving middleware with caching
refactor: update response handler utility for better error handling
