Add pull request labeler automation

[Copilot]

This PR implements automated pull request labeling to help organize and categorize contributions to the repository. The labeler automatically applies relevant labels based on the files changed in each pull request.

What's Added

GitHub Actions Workflow

• .github/workflows/labeler.yml - Automated workflow that triggers on pull request events (opened, synchronize, reopened) and applies labels based on the configuration file
• Uses the official GitHub Actions labeler with secure pull_request_target trigger and appropriate permissions

Labeling Configuration

• .github/labeler.yml - Comprehensive configuration defining labeling rules for different types of changes:
  • documentation - README, docs, and markdown files
  • code - Source code files in src/
  • tests - Test files and test directories
  • config - Configuration files (JSON, YAML, etc.)
  • dependencies - Package.json and lock files
  • typescript - TypeScript files
  • database - Database-related files and models
  • api - API routes, controllers, and middleware
  • build - Build tools and linting configurations

Documentation

• Updated README.md with an "Automation" section explaining the labeler functionality and available labels

Benefits

• Improved Organization: PRs are automatically categorized for easier review and project management
• Consistent Labeling: Eliminates manual labeling inconsistencies
• Better Filtering: Maintainers can quickly filter PRs by type of change
• Enhanced Workflow: Integrates seamlessly with existing CI/CD pipeline

The implementation follows security best practices and doesn't interfere with existing workflows or testing infrastructure.

Fixes #32.

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