feat(export): drive meta export table list from generated manifest

[pyramation]

Summary

Replaces the hand-maintained META_TABLE_ORDER / META_TABLE_CONFIG allowlists in @pgpmjs/export with a generated manifest, eliminating the drift that required one-off PRs like #1361.

• src/meta-export-tables.json (100 tables) is generated by constructive-db from the live database (constructive-io/constructive-db#2103) and propagated here by constructive-hub's schema-propagation workflow (constructive-io/constructive-hub#577). Already FK-topo-sorted.
• export-utils.ts:

  export const META_TABLE_ORDER: string[] = manifest.tables.map(t => t.key);
  export const META_TABLE_CONFIG = fromEntries(manifest.tables.map(t =>
    [t.key, { schema: t.schema, table: t.table, ...META_TABLE_OVERRIDES[t.key] }]));

  Hand-authored behavior stays in the new META_TABLE_OVERRIDES (field conflictDoNothing, sites/apis columnDefaults, sites/apps/site_metadata image/url typeOverrides, i18n_module gqlTypeName).
• export-meta.ts and export-graphql-meta.ts now iterate META_TABLE_ORDER instead of ~95 hardcoded queryAndParse calls each (database keyed by id, everything else by database_id; GraphQL flow batches per schema group). Dynamic field discovery and missing-table skip behavior unchanged.

Newly exported tables (previously silently dropped): composite_type, enum, view, view_grant, view_rule, view_table, partition, embedding_chunks, db_preset_module, principal_auth_module, resource_module. Stale entries that don't exist in constructive-db drop out (rls_function, levels_module, field_module, table_module, uuid_module, api_extensions). Runtime-only tables are blacklisted at generation time (blueprint, blueprint_construction, database_provision_module, db_pool, database_transfer). Note: integration_providers_module is not in the manifest yet because its table hasn't landed in constructive-db main; it will appear automatically once it does.

Tests updated to match: parity tests validate both flows iterate the manifest, and the boolean/int cross-flow parity case was repointed from the removed rls_function to policy. All 142 export tests pass.

Link to Devin session: https://app.devin.ai/sessions/fa0bd53e497742d2ab69753d3a7b3f4c
Requested by: @pyramation

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