Metin2 game client (P0–P11) + mobile asset pipeline

Networked client on the existing Godot 4.7 + libgr2 renderer:
- net: m2dev wire protocol (libsodium KX + XChaCha20), auth/select/game
  phases, EntityStore world model, ~all GC/CG headers. char create/delete,
  private shop / mall / cube, SHOP_GC_START_EX, guild, party (+ CG_PARTY_SET_STATE),
  quests, dragon soul, refine, safebox, exchange.
- UI: in-game windows migrated 1:1 from the reference uiscript/root .py —
  char status (/stat), inventory+equipment, select-item ([SELECT_ITEM] quest
  token), system-option + game-option + ESC system menu, private-shop 39-grid,
  party info board, shop tabs, atlas, minimap, quickbar, chat, …
- EterGrnLib polish: GR2 material blend/two-sided, LOD crossfade, motion-event
  dispatch, contact shadow, ray-AABB picking, weapon grip pre-transform.

Portable asset IO (A1) — all extension/libgr2/formats/mtproto reads routed
through godot::FileAccess (res:// PCK works on iOS/Android); standalone-lib
*_path() kept for the non-Godot CTests. AssetResolver + PropertyRegistry
switched to a baked index (bake_asset_index.gd) instead of std::filesystem.

Mobile builds: build-{android,ios}.sh, export-android.sh, pack-assets.sh,
gen-debug-keystore.sh. Assets ship as a zip mounted at runtime by
project/asset_pack.gd (adb push now; HTTP download is a drop-in later).

ctest 10/10, 34 GDScript suites, macOS/iOS/Android all build.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013EJxkHiNKS4kybHS3XKyAJ

formats/msm.h

@@ -0,0 +1,26 @@
+// .msm —— Metin2 种族/模型描述（文本，ScriptType RaceDataScript）。M2 T1。
+// 照 RaceManager.cpp CRaceData::LoadRaceData。
+#pragma once
+#include <string>
+#include <vector>
+
+namespace fmt {
+
+struct HairEntry {
+    int         index = 0;
+    std::string model;        // gr2（相对 PathName）
+    std::string source_skin;
+    std::string target_skin;
+};
+
+struct Msm {
+    std::string              base_model_gr2;   // BaseModelFileName
+    std::string              hair_path;        // HairData.PathName
+    std::vector<HairEntry>   hairs;
+    // 武器 / 时装挂点 / 材质类型按需补（PoC 先到发型 + base）
+};
+
+bool parse_msm(const std::string& text, Msm& out, std::string* err);
+bool parse_msm_file(const std::string& path, Msm& out, std::string* err);
+
+} // namespace fmt