#1035, #1036: Single-folder vs Subfolder Detection

[ethanluc7]

Related to issue: #1035, #1036

Summary

Extended buildCatalogsFromFolder function to support multi-catalog configuration by detecting whether the config path contains JSON files directly (single-catalog) or subdirectories (multi-catalog).

Description of Changes

• Extended buildCatalogsFromFolder to detect JSON files vs subdirectories in the config path
• Single-catalog mode (backward-compatible): reads JSONs directly from the config folder
• Multi-catalog mode: iterates subdirectories, each producing a separate catalog entry

Readiness Checklist

• Self Review
  • I have performed a self review of code
  • I have run the application locally and manually tested the feature
  • I have checked all updates to correct typos and misspellings
• Formatting
  • Code follows the project style guide
  • Automated code formatters (ie. Prettier) have been run
• Local Testing
  • Successfully built all packages locally
  • Successfully ran all test suites, all unit and integration tests pass
• Updated Tests
  • Unit and integration tests have been added that describe the bug that was fixed or the features that were added
• Documentation
  • All new environment variables added to .env.schema file and documented in the README
  • All changes to server HTTP endpoints have open-api documentation
  • All new functions exported from their module have TSDoc comment documentation