Update outdated type definitions for directus_notifications, directus_permissions, directus_extensions, directus_fields, directus_activity, directus_collections, and directus_revisions - #28072

What's Changed

• directus_notifications: id typed number (was string) in @directus/types and @directus/sdk; status/timestamp in @directus/types now match the DB (status not-nullable, timestamp nullable)
• directus_permissions: policy stays nullable in @directus/sdk (Thanks Judda!)
• directus_extensions: DirectusExtension['schema'] in @directus/sdk expanded to match ApiOutput.schema, including the entries array shape
• directus_fields: schema.schema, schema.comment, and schema.foreign_key_schema marked optional in @directus/sdk (DB-specific, not always present); generation_expression corrected to string | null and made optional
• Collection-name FK fields (notification.ts, permission.ts, field.ts, collection.ts, revision.ts, activity.ts) narrowed from bare string to keyof CompleteSchema<Schema>
• Fixed fallout in @directus/sdk REST commands

Tested Scenarios

• pnpm --filter @directus/sdk test
• Verified each finding against the relevant migration and, for directus_permissions, against api/src/services/permissions.ts + api/src/permissions/lib/with-app-minimal-permissions.ts

Review Notes / Questions / Concerns

• Type-only changes, no runtime behavior affected
• Permission.policy in @directus/types was intentionally left untouched (nullable) it's shared with synthetic permission objects built in memory, unrelated to this SDK fix

Checklist

Leave unchecked where not applicable

• Tests added/updated
• Documentation PR created in directus/docs
• OpenAPI updated
  • Local specs package (@directus/specs)
  • PR created in directus/openapi
• SDK (@directus/sdk) updated to reflect the changes
• Types (@directus/types) updated to reflect the changes
• GraphQL schema updated to reflect the changes
• System data (@directus/system-data) updated for changes to system collections/fields/relations
• Database migration added for schema/system changes
• Environment variables documented for new/changed config
• App translations added for new user-facing strings
• Security implications apply

• Fixes @directus/sdk/@directus/types shape drift across directus_notifications, directus_permissions, directus_extensions, and directus_fields #28065