docs(database): add current Vcore MariaDB schemas

database/schema/README.md

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+# Vcore Database Schemas
+
+This directory contains schema-only snapshots of the MariaDB databases
+used by Vcore (World of Warcraft Cataclysm 4.3.4).
+
+## Databases
+
+- cata_world
+- cata_locale_reference
+- cata_characters
+- cata_auth
+- cata_hotfixes
+- vcore_dev
+
+The files contain database structures only, not production table data.
+
+These snapshots reflect the database state at the time of export.
+They are not a substitute for SQL migrations or database backups.
+
+Initial snapshot: 2026-10-08.