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/ui/character_screen.cpp

@@ -246,8 +246,7 @@ void CharacterScreen::render(game::GameHandler& gameHandler) {
                     (previewAppearanceBytes_ != character.appearanceBytes) ||
                     (previewFacialFeatures_ != character.facialFeatures) ||
                     (previewUseFemaleModel_ != character.useFemaleModel) ||
-                    (previewEquipHash_ != equipHash) ||
-                    (!preview_->isModelLoaded());
+                    (previewEquipHash_ != equipHash);
 
                 if (changed) {
                     uint8_t skin = character.appearanceBytes & 0xFF;