feat(client): 完成40250客户端核心功能1:1对齐与桥梁高度采样修复

- 桥梁与静态物体高度采样修复：
  - 严格对齐 40250 CMapOutdoor::GetHeight 与 CAttributeInstance::GetHeight
  - 解析 .mdatr 中的 AttributeHeight 网格，使用 is_in_triangle_2d 准确计算桥面多边形平面方程
  - sample_height 查询邻近区块并返回 fMAX(fObjectHeight, fTerrainHeight)，彻底解决走上桥面穿透掉入水底/河床的问题
  - 新增 test_bridge_height_parity.gd 自动化对拍测试
- 40250 怪物击杀经验动效：
  - 1:1 实现 FLY_EXP(0) / FLY_HP / FLY_SP 粒子轨迹与爆炸吸附
- 40250 客户端全系统功能对齐（Batches 1-31）：
  - 包含公会、交易、骑乘、变身、钓鱼、采矿、商城、信件、结婚、地牢等 134 套对拍系统与自动化回归测试
- 文档沉淀：
  - 新增 docs/CLIENT-PARITY-AUDIT-AND-FIX-GUIDE.md 客户端对拍缺陷发现与修复工程指南

project/ui/quest_curtain.gd

@@ -0,0 +1,94 @@
+# QuestCurtain (40250 uiquest.py:58-105 对齐)
+# 剧情 / 过场运镜模式的 16:9 电影上下黑边（Curtain / Letterbox）
+class_name QuestCurtain
+extends Control
+
+const CURTAIN_SPEED := 200.0
+const MIN_BAR_HEIGHT := 50.0
+
+var top_bar: ColorRect
+var bottom_bar: ColorRect
+var _bar_height := 60.0
+var _is_open := false
+var _tween: Tween
+
+func _init() -> void:
+	name = "QuestCurtain"
+	set_anchors_preset(PRESET_FULL_RECT)
+	mouse_filter = MOUSE_FILTER_IGNORE
+	z_index = 95
+
+	top_bar = ColorRect.new()
+	top_bar.name = "TopBar"
+	top_bar.color = Color.BLACK
+	top_bar.mouse_filter = MOUSE_FILTER_IGNORE
+	add_child(top_bar)
+
+	bottom_bar = ColorRect.new()
+	bottom_bar.name = "BottomBar"
+	bottom_bar.color = Color.BLACK
+	bottom_bar.mouse_filter = MOUSE_FILTER_IGNORE
+	add_child(bottom_bar)
+
+	_reset_layout()
+
+func _ready() -> void:
+	get_viewport().size_changed.connect(_on_size_changed)
+	_reset_layout()
+
+func _get_screen_size() -> Vector2:
+	if is_inside_tree() and get_viewport():
+		return get_viewport_rect().size
+	return Vector2(1024, 768)
+
+func _on_size_changed() -> void:
+	if _is_open:
+		_calculate_bar_height()
+		var sz := _get_screen_size()
+		top_bar.position = Vector2(0, 0)
+		top_bar.size = Vector2(sz.x, _bar_height)
+		bottom_bar.position = Vector2(0, sz.y - _bar_height)
+		bottom_bar.size = Vector2(sz.x, _bar_height)
+	else:
+		_reset_layout()
+
+func _calculate_bar_height() -> float:
+	var sz := _get_screen_size()
+	# 40250: (GetScreenHeight() - GetScreenWidth() * 9 // 16) // 2
+	var h: float = floorf((sz.y - sz.x * 9.0 / 16.0) / 2.0)
+	if h < MIN_BAR_HEIGHT:
+		h = MIN_BAR_HEIGHT
+	_bar_height = h
+	return _bar_height
+
+func _reset_layout() -> void:
+	var sz := _get_screen_size()
+	_calculate_bar_height()
+	top_bar.position = Vector2(0, -_bar_height - 1.0)
+	top_bar.size = Vector2(sz.x, _bar_height)
+	bottom_bar.position = Vector2(0, sz.y + 1.0)
+	bottom_bar.size = Vector2(sz.x, _bar_height)
+
+func open(duration: float = 0.4) -> void:
+	_is_open = true
+	var sz := _get_screen_size()
+	_calculate_bar_height()
+	if _tween and _tween.is_valid():
+		_tween.kill()
+	_tween = create_tween().set_parallel(true).set_trans(Tween.TRANS_QUAD).set_ease(Tween.EASE_OUT)
+	top_bar.size = Vector2(sz.x, _bar_height)
+	bottom_bar.size = Vector2(sz.x, _bar_height)
+	_tween.tween_property(top_bar, "position:y", 0.0, duration)
+	_tween.tween_property(bottom_bar, "position:y", sz.y - _bar_height, duration)
+
+func close(duration: float = 0.4) -> void:
+	_is_open = false
+	var sz := _get_screen_size()
+	if _tween and _tween.is_valid():
+		_tween.kill()
+	_tween = create_tween().set_parallel(true).set_trans(Tween.TRANS_QUAD).set_ease(Tween.EASE_IN)
+	_tween.tween_property(top_bar, "position:y", -_bar_height - 1.0, duration)
+	_tween.tween_property(bottom_bar, "position:y", sz.y + 1.0, duration)
+
+func is_open() -> bool:
+	return _is_open