* ✨ feat(database): add resource transfer requests schema and migration
* ♻️ refactor(database): move transfer enums to @lobechat/types and drop schema-level enum typing
* 📝 docs(skill): add schema conventions (no pg enums for growing domains, no const exports from schemas) to db-migrations
* 🐛 fix(database): preserve transfer audit rows when actors are deleted (set null instead of cascade)
* 🐛 fix(database): exclude null-recipient rows from the pending-transfer unique index
* 📝 docs(skill): scope the schema-constant rule to domain literals in new/modified schemas
Rdmclin2