feat(export): add 6 new services_public settings tables to export

[pyramation]

Summary

Registers the 6 new services_public settings tables (from constructive-db#1060) in the pgpm export system so they are included during database exports.

Tables added: database_settings, api_settings, rls_settings, cors_settings, pubkey_settings, webauthn_settings

Files changed (all in pgpm/export/src/):

• export-utils.ts — field configs in META_TABLE_CONFIG + entries in META_TABLE_ORDER
• export-meta.ts — queryAndParse() calls for SQL export flow
• export-graphql-meta.ts — queryAndParse() calls for GraphQL export flow

Both export flows already handle missing tables gracefully (42P01 catch in SQL, field-not-found catch in GraphQL), so this is safe to merge before or after constructive-db#1060.

Review & Testing Checklist for Human

• Verify field definitions match the actual DB columns in constructive-db#1060 — the META_TABLE_CONFIG field types were derived from the deploy SQL, but any last-minute column changes in the schema PR would cause a mismatch. Cross-reference especially: rls_settings uses _fn suffixed columns (current_role_fn, etc.) and webauthn_settings.challenge_expiry_seconds is bigint mapped to 'int'.
• api_settings nullable booleans — The DB columns are nullable (boolean without NOT NULL) for inheritance semantics, but the config types them as 'boolean'. Confirm buildDynamicFields() / mapPgTypeToFieldType() handles nullable bool columns correctly (the PG udt_name is bool regardless of nullability, so this should be fine, but worth a sanity check).
• Run a local export against a database that has these tables deployed to verify the full round-trip produces valid SQL INSERT statements.

Notes

• Related: constructive-planning#814 tracks genericizing the export to auto-discover tables, eliminating the need for these manual additions in the future.
• The schema column name used in pubkey_settings and webauthn_settings is not a PostgreSQL reserved keyword but may warrant attention if it causes GraphQL inflection issues.

Link to Devin session: https://app.devin.ai/sessions/94a2728a9c414500bead29cbbc829c15
Requested by: @pyramation

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