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

project/locale.gd

@@ -0,0 +1,66 @@
+# Locale —— EterLocale 字符串表（`locale/locale/<lang>/*.txt`，KEY\tVALUE，UTF-8）。
+# Godot 原生处理 UTF-8 + 拉丁/西里尔/希腊/阿拉伯；CJK 需外挂字体（apply_font）。
+# 用 preload("res://locale.gd").new()；setup() 后 t("KEY", [args]).
+extends RefCounted
+
+var _lang := "en"
+var _tab := {}                 # KEY -> value
+var _base := ""
+
+func setup(assets_root: String, lang := "en") -> void:
+	_base = assets_root.path_join("locale/locale")
+	set_lang(lang)
+
+func set_lang(lang: String) -> void:
+	_lang = lang
+	_tab.clear()
+	var dir := _base.path_join(lang)
+	if not DirAccess.dir_exists_absolute(dir):
+		push_warning("[locale] no such lang: " + dir)
+		return
+	for f in ["locale_interface.txt", "locale_game.txt", "itemdesc.txt", "skilldesc.txt"]:
+		_load_table(dir.path_join(f))
+
+func _load_table(path: String) -> void:
+	if not FileAccess.file_exists(path):
+		return
+	var fa := FileAccess.open(path, FileAccess.READ)
+	if fa == null:
+		return
+	while not fa.eof_reached():
+		var line := fa.get_line()
+		if line.is_empty() or line.begins_with("#"):
+			continue
+		var tab := line.find("\t")
+		if tab < 0:
+			continue
+		var key := line.substr(0, tab).strip_edges()
+		var val := line.substr(tab + 1).strip_edges()
+		if not key.is_empty():
+			_tab[key] = val
+
+func lang() -> String:
+	return _lang
+
+func has(key: String) -> bool:
+	return _tab.has(key)
+
+# t("SELECT_LEVEL") -> "Level"；t("AFF_LOVE_POINT", [42]) -> "Love points: 42%"
+# 缺失时返回 "<KEY>"（开发期一眼可见）。
+func t(key: String, args: Array = []) -> String:
+	if not _tab.has(key):
+		return "<" + key + ">"
+	var s: String = _tab[key]
+	if args.is_empty():
+		return s
+	return s % args if args.size() > 1 else (s % args[0])
+
+# 给一个 Control / Window 挂 CJK（或其它）字体。ttf_path 为空则不动。
+func apply_font(node: Control, ttf_path: String, size := 0) -> void:
+	if ttf_path.is_empty() or not FileAccess.file_exists(ttf_path):
+		return
+	var f := FontFile.new()
+	f.load_dynamic_font(ttf_path)
+	node.add_theme_font_override("font", f)
+	if size > 0:
+		node.add_theme_font_size_override("font_size", size)