feat(pgpm): improve export command UX with smart defaults

[pyramation]

feat(pgpm): improve export command UX with smart defaults

Summary

This PR improves the UX of the pgpm export command by:

1. Changing multi-select to single-select - Both databases and database_ids prompts now use list type instead of checkbox, since only one selection was actually being used
2. Fixing a selection bug - The original code mapped ALL options in database_ids instead of just the selected one
3. Adding smart defaults - metaExtensionName now defaults to {databaseName}-service instead of just svc
4. Skipping boilerplate prompts - Passes answers object to initModule with moduleName, moduleDesc, and access to skip redundant prompts during export
5. Auto-generating descriptions - DB package gets {name} database schema for {databaseName}, meta package gets {metaExtensionName} service utilities for managing domains, APIs, and services

Updates since last revision

• Changed default access from 'public' to 'restricted' per feedback
• Removed packageIdentifier from answers (no longer required per feedback)

Review & Testing Checklist for Human

• Verify the non-null assertion on line 82 (selectedDatabase!.id) - if dbsResult.rows.find() returns undefined, this will throw. Consider whether error handling is needed.
• Confirm access: 'restricted' is the desired default - This was changed from 'public' per feedback; verify this is correct for exported packages.
• Test the export command end-to-end - Run pgpm export in a workspace with a database to verify:
  • Single-select prompts work correctly
  • Defaults are populated as expected
  • No boilerplate prompts appear for moduleName/moduleDesc/access
  • Generated packages have correct descriptions and access: restricted
• Verify answers field names match boilerplate template - The fields moduleName, moduleDesc, access should match what the module boilerplate template expects

Notes

• The description formats are hardcoded - let me know if you'd like different wording
• Link to Devin run: https://app.devin.ai/sessions/67f8153e117d4d23bbc9e156dc76fc37
• Requested by: Dan Lynch (@pyramation)

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