fix: add security-focused .gitignore entries and .env.example template

[dmccarty666]

Summary

This PR adds essential security-focused configuration files to protect sensitive data and credentials.

Changes

• Added comprehensive .gitignore entries to exclude:

  • Environment files (.env, .env.*)
  • Node.js dependencies (node_modules/)
  • Log files (*.log)
  • OS-specific files (.DS_Store, Thumbs.db)
  • Editor files (.vscode/, .idea/)
  • Build outputs (dist/, build/, coverage/)
  • Temporary files

• Added .env.example template with placeholder values for:

  • Application configuration (PORT, NODE_ENV, LOG_LEVEL)
  • Database connection strings
  • API keys and secrets
  • Authentication settings

Security Impact

These changes prevent accidental commits of sensitive credentials and follow security best practices for Node.js applications.

Testing

• Verified .gitignore patterns match expected file exclusions
• Confirmed .env.example provides clear documentation for required environment variables

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Related: Bug fix workflow for cron-34adb1b6

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