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/p2b_test.gd

@@ -0,0 +1,97 @@
+# p2b_test —— P2 续：地面掉落物 + PlayerView（真模型）headless 自检。
+#   godot --headless --path project --script p2b_test.gd
+extends SceneTree
+
+const GroundItems = preload("res://ui/ground_items.gd")
+const PlayerView = preload("res://ui/player_view.gd")
+
+class FakeClient extends Node:
+	signal ground_item_added(item: Dictionary)
+	signal ground_item_removed(vid: int)
+	var ground := {}
+	var picked := []
+	func get_ground_items() -> Array: return ground.values()
+	func pickup_item(vid) -> bool: picked.append(vid); return true
+	func add_ground(vid, vnum, pos):
+		ground[vid] = {"vid": vid, "vnum": vnum, "pos": pos}
+		ground_item_added.emit(ground[vid])
+	func del_ground(vid):
+		ground.erase(vid); ground_item_removed.emit(vid)
+
+class FakeProto extends Node:
+	func item(vnum: int) -> Dictionary:
+		return {"vnum": vnum, "name": "N%d" % vnum, "locale_name": "掉落%d" % vnum}
+
+var _fail := 0
+func _ck(c: bool, m: String) -> void:
+	if not c:
+		_fail += 1
+		printerr("FAIL: " + m)
+
+func _init() -> void:
+	_run()
+	if _fail == 0:
+		print("PASS: p2b_test (ground items + player view)")
+		quit(0)
+	else:
+		printerr("%d check(s) failed" % _fail)
+		quit(1)
+
+func _run() -> void:
+	# --- ground items ---
+	var mount := Node3D.new()
+	var fc := FakeClient.new()
+	var fp := FakeProto.new()
+	var pl := Node3D.new()
+	get_root().add_child(mount)
+	get_root().add_child(fc)
+	get_root().add_child(fp)
+	get_root().add_child(pl)
+	pl.position = Vector3.ZERO
+
+	var gi: Node = GroundItems.new()
+	get_root().add_child(gi)
+	gi.setup(fc, mount, func() -> Node: return pl, fp, null)
+
+	fc.add_ground(101, 27, Vector3(1, 0, 1))       # 距玩家 ~1.4m（范围内）
+	fc.add_ground(102, 28, Vector3(20, 0, 0))      # 远
+	await process_frame
+	_ck(mount.get_child_count() == 2, "2 drop nodes spawned")
+	_ck(mount.get_node_or_null("drop_101") != null, "drop_101 present")
+	var tag := mount.get_node("drop_101").get_node("tag") as Label3D
+	_ck(tag.text == "掉落27", "drop name from proto")
+
+	# 拾取最近的（101 在范围，102 不在）
+	var got: int = gi.try_pickup()
+	_ck(got == 101, "try_pickup -> nearest 101, got %d" % got)
+	_ck(fc.picked == [101], "client.pickup_item(101) called")
+
+	fc.del_ground(101)
+	await process_frame
+	_ck(mount.get_node_or_null("drop_101") == null, "drop_101 freed on removed")
+	_ck(mount.get_child_count() == 1, "1 drop left")
+
+	# 远处的捡不到
+	_ck(gi.try_pickup() == 0, "far item not picked")
+
+	# --- player view（有真资产才建）---
+	var assets := AssetRoot.path()
+	if not DirAccess.dir_exists_absolute(assets.path_join("PC/ymir work/pc/warrior")):
+		print("  (skip PlayerView: no PC assets)")
+		return
+	if not ClassDB.class_exists("Metin2Model"):
+		print("  (skip PlayerView: extension not built)")
+		return
+	var pv: Node3D = PlayerView.new()
+	get_root().add_child(pv)
+	var ok: bool = pv.build(assets, 0)   # race 0 = warrior male
+	_ck(ok, "PlayerView.build(race 0) ok")
+	_ck(pv.model != null, "PlayerView has Metin2Model")
+	_ck(pv.motion_dir.ends_with("warrior/general"), "motion_dir -> warrior/general (%s)" % pv.motion_dir)
+	# 转发 set
+	pv.set("weapon_gr2", "/tmp/fake_weapon.gr2")
+	_ck(String(pv.model.get("weapon_gr2")) == "/tmp/fake_weapon.gr2", "PlayerView forwards weapon_gr2 to model")
+	pv.set_anim_state("run")
+	await process_frame
+	if pv.anim:
+		_ck(String(pv.anim.get("anim_path")).ends_with("run.msa"), "set_anim_state('run') -> run.msa")