Setup: Add support for environment-specific .env files - #1

Summary

• Add support for loading environment-specific .env files (.env.local for development, .env for production)
• Enables secure separation of local development credentials and production credentials

Changes

• Created server/db.js with NODE_ENV detection for loading appropriate .env file
• Development mode (default) uses .env.local (not tracked in git)
• Production mode uses .env (should be set in deployment environment)
• Created server/.gitignore to prevent .env files from being committed

How it works

// In development (NODE_ENV not set):
require('dotenv').config({ path: '.env.local' })

// In production (NODE_ENV=production):
require('dotenv').config({ path: '.env' })

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