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/property.h

@@ -0,0 +1,55 @@
+// Property 文件（`.prb` Building / `.prt` Tree / `.pre` Effect / `.prd` DungeonBlock /
+// `.pra` Ambience）+ CRC 注册表。SHINSOO §5.6 / §9-W0 / BACKLOG E13。
+//
+// 文件格式（文本）：
+//   行1: YPRT
+//   行2: <crc>            十进制 uint32
+//   行3+: <key>\t"<value>"   （key 小写，value 去引号）
+//
+// AreaData 的 property_crc 指向这里的 crc。W0 只建 crc -> Property 索引，不做实例化。
+#pragma once
+#include <cstdint>
+#include <map>
+#include <string>
+#include <vector>
+
+namespace fmt {
+
+enum class PropertyType { Unknown, Tree, Building, Effect, Ambience, DungeonBlock };
+
+struct Property {
+    uint32_t     crc = 0;
+    PropertyType type = PropertyType::Unknown;
+    std::string  name;                       // propertyname
+    std::string  type_str;                   // propertytype 原字符串
+    std::map<std::string, std::string> kv;   // 全部键值（含 buildingfile / treefile / ...）
+    std::string  source_path;                // 来源文件（诊断用）
+
+    std::string get(const std::string& key, const std::string& def = "") const;
+};
+
+PropertyType property_type_from_string(const std::string& s);
+
+bool parse_property(const std::string& text, Property& out, std::string* err);
+bool parse_property_file(const std::string& path, Property& out, std::string* err);
+
+// 扫一个目录树，收集所有 property 文件，按 crc 索引。
+struct PropertyRegistry {
+    std::map<uint32_t, Property> by_crc;
+    int  files_scanned = 0;
+    int  parse_failed = 0;
+    int  crc_collisions = 0;                  // 同 crc 出现多次（保留第一个）
+    std::vector<std::string> failed_paths;
+    std::map<std::string, int> type_counts;   // "Tree" -> N ...
+
+    const Property* find(uint32_t crc) const;
+    // root 通常是 `<assets>/Property`。递归找 *.prb/*.prt/*.pre/*.prd/*.pra（std::filesystem）。
+    bool scan(const std::string& root, std::string* err);
+
+    // 同上，但文件清单外部给（PCK 里没法 recursive_directory_iterator）。
+    // rel_paths 里挑属性扩展名的，逐个 read_file(root + "/" + rel) 解析。
+    bool scan_list(const std::string& root, const std::vector<std::string>& rel_paths,
+                   std::string* err);
+};
+
+} // namespace fmt