Implements a full character creation UI integrated into the existing flow.
In single-player mode, auth screen now goes to character creation before
entering the world. In online mode, a "Create Character" button on the
character selection screen sends CMSG_CHAR_CREATE to the server. Includes
WoW 3.3.5a race/class combo validation and appearance range limits.
- Create ATTRIBUTION.md crediting WoWDev Wiki, TrinityCore, MaNGOS,
and third-party libraries used
- Add WoWDev Wiki format specification links to file format parsers
(ADT, BLP, DBC loaders)
- Add protocol documentation reference to opcodes.hpp