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/world/world_time.gd

@@ -0,0 +1,73 @@
+# WorldTime (P9) —— 昼夜循环：GC_TIME 的服务器时钟 → 太阳角度 + 光色 + 环境色。
+#
+#   var wt := preload("res://world/world_time.gd").new()
+#   add_child(wt)
+#   wt.setup(m2client, sun_light, environment)   # environment 可空
+#
+# GC_TIME 给的是 unix 秒。本地按 delta 累加，得到「日内秒」(0..86400)。
+# 06:00 日出、12:00 正午、18:00 日落、0:00 午夜。太阳 pitch 随之走。
+extends Node
+
+const DAY := 86400.0
+const CYCLE_SCALE := 1.0   # >1 加速昼夜（调试用）
+
+var client: Node
+var sun: DirectionalLight3D
+var env: Environment
+var _epoch := 0.0          # 最近一次 GC_TIME 的服务器 unix 秒
+var _since := 0.0          # 收到后本地经过的秒
+var _have_time := false
+
+func setup(m2client: Node, sun_light: DirectionalLight3D, environment: Environment = null) -> void:
+	client = m2client
+	sun = sun_light
+	env = environment
+	if client and client.has_signal("time_changed"):
+		client.time_changed.connect(_on_time)
+	if client and client.has_method("get_server_time"):
+		var t: int = client.get_server_time()
+		if t > 0:
+			_on_time(t)
+
+func _on_time(server_epoch: int) -> void:
+	_epoch = float(server_epoch)
+	_since = 0.0
+	_have_time = true
+
+# 当前日内秒（0..86400）。没有 GC_TIME 时固定用「正午」——不要跟着玩家的系统钟
+# 走到半夜把整个场景变黑（那不是 m2dev-client-main 的行为）。
+const DEFAULT_NOON := 43200.0
+
+func seconds_of_day() -> float:
+	if not _have_time:
+		return DEFAULT_NOON
+	return fmod((_epoch + _since) * CYCLE_SCALE, DAY)
+
+# 0 = 午夜, 0.25 = 日出, 0.5 = 正午, 0.75 = 日落
+func day_fraction() -> float:
+	return seconds_of_day() / DAY
+
+func _process(delta: float) -> void:
+	_since += delta
+	if sun == null:
+		return
+	var f := day_fraction()
+	# 太阳高度角：正午(0.5)最高 ~ -85°(朝下)，午夜最低 ~ +85°(朝上，被地平线挡)
+	var elevation := sin((f - 0.25) * TAU) * 80.0   # -80..80
+	var azimuth := lerpf(40.0, 220.0, f)
+	sun.rotation = Vector3(deg_to_rad(-elevation), deg_to_rad(azimuth), 0.0)
+	# 光照强度 & 颜色：白天暖白，黄昏偏橙，夜里近黑冷蓝
+	var daylight := clampf(sin((f - 0.25) * TAU) * 1.4 + 0.3, 0.0, 1.0)
+	sun.light_energy = lerpf(0.03, 1.15, daylight)
+	var warm := Color(1.0, 0.55, 0.30)
+	var noon := Color(1.0, 0.97, 0.90)
+	var night := Color(0.35, 0.42, 0.65)
+	if daylight < 0.35:
+		sun.light_color = night.lerp(warm, daylight / 0.35)
+	else:
+		sun.light_color = warm.lerp(noon, (daylight - 0.35) / 0.65)
+	if env:
+		env.ambient_light_energy = lerpf(0.12, 0.6, daylight)
+		env.ambient_light_color = Color(0.16, 0.19, 0.30).lerp(Color(0.5, 0.55, 0.62), daylight)
+		if env.background_mode == Environment.BG_COLOR:
+			env.background_color = Color(0.03, 0.04, 0.09).lerp(Color(0.55, 0.62, 0.72), daylight)

project/world/world_time.gd.uid

@@ -0,0 +1 @@
+uid://bgp1ppw42yo7