feat(pgpm): add CLOSED license, comment out security-related dbname updates, rename sqitchDir to pgpmDir

[pyramation]

Summary

This PR makes three changes to the export-migrations.ts file in pgpm/core:

1. License field: Added license: 'CLOSED' to the answers object passed to initModule for both exported packages (database dump and services)

2. Security-related SQL commented out: Commented out the UPDATE meta_public.apis/sites SET dbname = current_database() statements with a TODO note explaining these may be a security leak that needs further research

3. Variable rename: Renamed sqitchDir to pgpmDir for consistency with pgpm naming conventions

Review & Testing Checklist for Human

• Verify the commented-out SQL doesn't break import functionality: The UPDATE statements were rebinding dbname to the target database after import. Commenting them out means the dbname field in meta_public.apis and meta_public.sites will retain whatever value was exported. Confirm this is the intended behavior.

• Confirm "CLOSED" is the correct license string: This is not a standard SPDX identifier. Verify the template system accepts this value and it produces the expected license field in generated package.json files.

• Test an actual export flow if possible: Run pgpm export against a database with the required schemas to verify the exported packages are generated correctly with the new license value.

Notes

This is PR 1 of a planned series. PR 2 will rename the Sqitch-related types and functions (SqitchRow → PgpmRow, writeSqitchPlan → writePgpmPlan, etc.).

Link to Devin run: https://app.devin.ai/sessions/7e7813472a0643aa88ccb509b288050a
Requested by: Dan Lynch (@pyramation)

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