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/texture_set.cpp

@@ -0,0 +1,66 @@
+#include "texture_set.h"
+
+#include "m2_tokvec.h"
+
+#include <cstdio>
+#include <cstdlib>
+
+namespace fmt {
+
+bool parse_texture_set(const std::string& text, TextureSet& out, std::string* err) {
+    TokVecMap tv;
+    std::string perr;
+    parse_tokvec(text, tv, &perr);
+
+    out = TextureSet{};
+
+    if (!tv.has("textureset")) {
+        if (err) *err = "textureset 缺首行 `TextureSet`";
+        return false;
+    }
+    if (!tv.has("texturecount")) {
+        if (err) *err = "textureset 缺 TextureCount";
+        return false;
+    }
+    out.declared_count = (int)tv.inum("texturecount");
+    if (out.declared_count < 0) {
+        if (err) *err = "textureset TextureCount 非法";
+        return false;
+    }
+
+    for (int i = 1; i <= out.declared_count; ++i) {
+        char key[32];
+        std::snprintf(key, sizeof(key), "texture%03d", i);
+        const auto* v = tv.find(key);
+        if (!v) {
+            if (err) *err = std::string("textureset 缺块 ") + key;
+            return false;
+        }
+        if (v->size() < 8) {
+            if (err) *err = std::string("textureset 块 ") + key + " token 不足 8 个";
+            return false;
+        }
+        TextureLayer L;
+        L.texture = (*v)[0];
+        L.u_scale = (float)std::atof((*v)[1].c_str());
+        L.v_scale = (float)std::atof((*v)[2].c_str());
+        L.u_offset = (float)std::atof((*v)[3].c_str());
+        L.v_offset = (float)std::atof((*v)[4].c_str());
+        L.splat_enabled = std::atoi((*v)[5].c_str()) != 0;
+        L.height_begin = (unsigned short)std::atoi((*v)[6].c_str());
+        L.height_end = (unsigned short)std::atoi((*v)[7].c_str());
+        out.layers.push_back(std::move(L));
+    }
+    return true;
+}
+
+bool parse_texture_set_file(const std::string& path, TextureSet& out, std::string* err) {
+    std::string text;
+    if (!read_file(path, text)) {
+        if (err) *err = "打不开 " + path;
+        return false;
+    }
+    return parse_texture_set(text, out, err);
+}
+
+} // namespace fmt