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

include/auth/auth_packets.hpp

@@ -130,7 +130,8 @@ struct RealmListResponse {
 // REALM_LIST response parser
 class RealmListResponseParser {
 public:
-    static bool parse(network::Packet& packet, RealmListResponse& response);
+    // protocolVersion: 3 = vanilla (uint8 realmCount, uint32 icon), 8 = WotLK (uint16 realmCount, uint8 icon)
+    static bool parse(network::Packet& packet, RealmListResponse& response, uint8_t protocolVersion = 8);
 };
 
 } // namespace auth