Right-click now attacks hostile NPCs (npcFlags==0) and interacts with
friendly ones in online mode. Parse UNIT_FIELD_FLAGS (59) and
UNIT_NPC_FLAGS (82) from update packets. Stop auto-attack when target
dies or despawns. Add CMSG_ITEM_QUERY_SINGLE/SMSG_ITEM_QUERY_SINGLE_RESPONSE
to populate inventory from server item objects and player slot fields.
- Use 6-byte CMSG header (uint16 size + uint32 opcode) for client-to-server
- Enable RC4 encryption immediately after sending AUTH_SESSION
- Encrypt all 6 header bytes to match AzerothCore expectations
- Add 8-byte addon info (addonCount + clientTime) for proper parsing
- Fix CharCreateResult enum to use correct WoW 3.3.5a response codes
- Add CHAR_NAME_* error codes for name validation messages
- Allow character list refresh from CHAR_LIST_RECEIVED state
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.
