2V2-e.2: Godot consumer of the 3D draw commands, offline screenshot

python_3d_surface.gd turns RenderGame's recorded draws into meshes under a
camera read back from SetPerspective; textures come from the 40250 packs.
GetFarClip and the CMapManager ctor ported verbatim. Until the environment
is ported, lit draws with no light/ambient are shown unshaded (stand-in).
script/python_game_render_test.sh runs system.py login -> select -> game
against port_fake_login_server (or --live via MT_LIVE_*) and screenshots.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

project/ui/ui_assets.gd

@@ -37,6 +37,19 @@ static func load_tex(assets_root: String, vpath: String) -> Texture2D:
 	_cache[key] = tex
 	return tex
 
+# 只从 40250 Client/pack（Metin2Pack）取，不看 assets/ 散文件：移植的客户端从包里读模型，
+# 贴图也必须是同一份（assets/ 里同名的 fork 贴图 UV 布局可能不同）。
+static func load_pack_tex(vpath: String) -> Texture2D:
+	if vpath == "":
+		return null
+	var key := "pack|" + vpath
+	if _cache.has(key):
+		return _cache[key]
+	# 40250 的包名带盘符（d:/ymir work/...），原样交给 CEterPackManager。
+	var tex: Texture2D = _load_pack_image(vpath.replace("\\", "/"))
+	_cache[key] = tex
+	return tex
+
 static func _strip_drive(p: String) -> String:
 	var s := p.replace("\\", "/")
 	if s.length() >= 2 and s[1] == ":":