Minecraft MySQL JDBC

modrinth body: document the public API + holder-driven engine upgrade

Recasts the 'this mod is inert on Bukkit' framing into the two-path distinction:

• Default path (DriverManager.getConnection): bundled driver wins, this mod is no-op.
• Workaround path (MinecraftSqliteJdbc.connect / MinecraftMysqlJdbc.connect): child-first classloader gives consumers explicit access to this mod's driver, useful for newer engine features the server's bundled driver doesn't have.

Adds API table + softdepend + code snippet so consumer plugin authors can wire it up. Cross-references Grim's wiki for the auto-detection integration.