Vanilla/Turtle WoW support: M2 loading, bone parsing, textures, auth

- Vanilla M2 bone struct (108 bytes) with 28-byte animation tracks
- Version-aware bone parsing (vanilla vs WotLK format detection)
- Fix CharSections.dbc field layout for vanilla (variation/color at 4-5)
- Remove broken CharSections.csv files (all fields marked as strings)
- Expansion data reload on profile switch (DBC cache clear, layout reload)
- Vanilla packet encryption (VanillaCrypt XOR-based header crypt)
- Extended character preview geoset range (0-99) for vanilla models
- DBC cache clear support in AssetManager

src/game/expansion_profile.cpp

@@ -165,6 +165,7 @@ bool ExpansionRegistry::loadProfile(const std::string& jsonPath, const std::stri
     }
 
     p.build = static_cast<uint16_t>(jsonInt(json, "build"));
+    p.worldBuild = static_cast<uint16_t>(jsonInt(json, "worldBuild", p.build));
     p.protocolVersion = static_cast<uint8_t>(jsonInt(json, "protocolVersion"));
     // Optional client header fields (LOGON_CHALLENGE)
     {