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.cpp

@@ -0,0 +1,36 @@
+// M2 T1 —— .msm 解析（照 RaceManager.cpp CRaceData::LoadRaceData 的字段子集）。
+#include "msm.h"
+#include "textscript.h"
+
+namespace fmt {
+
+static bool fill(const Node& root, Msm& out, std::string* err) {
+    out = Msm{};
+    out.base_model_gr2 = root.str("BaseModelFileName");
+    if (const Node* hd = root.group("HairData")) {
+        out.hair_path = hd->str("PathName");
+        for (const Node& h : hd->groups) {
+            HairEntry e;
+            e.index       = h.inum("HairIndex");
+            e.model       = h.str("Model");
+            e.source_skin = h.str("SourceSkin");
+            e.target_skin = h.str("TargetSkin");
+            out.hairs.push_back(std::move(e));
+        }
+    }
+    if (out.base_model_gr2.empty()) { if (err) *err = "msm: 缺 BaseModelFileName"; return false; }
+    return true;
+}
+
+bool parse_msm(const std::string& text, Msm& out, std::string* err) {
+    Node root;
+    if (!parse_textscript(text, root, err)) return false;
+    return fill(root, out, err);
+}
+bool parse_msm_file(const std::string& path, Msm& out, std::string* err) {
+    Node root;
+    if (!parse_textscript_file(path, root, err)) return false;
+    return fill(root, out, err);
+}
+
+} // namespace fmt