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/skill_test.gd

@@ -23,6 +23,8 @@ class FakeClient extends Node:
 	signal skills_changed()
 	signal skill_cooldown_end(skill: int)
 	signal quickslots_changed()
+	signal skill_group_changed(group: int)
+	signal entity_main_set(vid: int)
 	var skills := [{"id": 1, "level": 5, "master": 0}, {"id": 16, "level": 3, "master": 2}]
 	var skill_group := 1
 	var points := {"level": 30, "skill_active": 5, "skill_support": 3, "skill_horse": 2}
@@ -91,6 +93,10 @@ func _run() -> void:
 	if skill_icon:
 		_ck(skill_icon.get_width() == 32 and skill_icon.get_height() == 32,
 				"skill 1 icon region is 32x32")
+	var strong_body_icon := UiAssets.load_tex(assets,
+			"ETC/ymir work/ui/skill/warrior/cheongeun_03.sub")
+	_ck(strong_body_icon is AtlasTexture and int(strong_body_icon.region.position.y) == 0,
+			"DDS .sub uses top-left coordinates (Strong Body top row -> decoded y=0)")
 	_ck(st.is_attack(1), "skill 1 是 ATTACK_SKILL")
 	_ck(st.is_ranged(46), "skill 46 bow skill is ranged")
 	_ck(not st.is_ranged(1), "skill 1 melee skill is not ranged")
@@ -324,6 +330,20 @@ func _run() -> void:
 	qb.activate(0)
 	_ck(fc.casts.size() == 1, "server refresh cannot reset skill cooldown")
 	fc.quickslots = [] # restore this fixture's original server state for later UI cases
+	# 40250 quickslot skill refs are player skill-slot numbers. The same ref=2
+	# selects a different skill after switching warrior skill group.
+	fc.skill_group = 2
+	fc.quickslots = [{"pos": 0, "type": 2, "ref": 2}]
+	qb.restore_from_server()
+	_ck(int(qb._state[0].id) == 17 and int(qb._state[0].ref) == 2,
+		"warrior group 2 quickslot ref 2 -> skill 17")
+	fc.quickslot_ops.clear()
+	qb.assign(0, "skill", 20)
+	_ck(fc.quickslot_ops == [["add", 0, 2, 5]],
+		"assign warrior group 2 skill 20 persists player skill-slot 5")
+	fc.skill_group = 1
+	fc.quickslots = []
+	qb.assign(0, "skill", 1, false)
 	qb._clear(1)
 	# GC_SKILL_COOLTIME_END 提前解锁
 	fc.skill_cooldown_end.emit(1)
@@ -395,7 +415,7 @@ func _run() -> void:
 	fc.quickslots = [{"pos": 2, "type": 2, "ref": 16}, {"pos": 3, "type": 1, "ref": 9},
 			{"pos": 4, "type": 3, "ref": 11}]
 	qb2.setup(fc, st, ui, func() -> Node: return pl)   # setup 里自动 restore_from_server
-	_ck(qb2._root.size == Vector2(400, 56) and qb2._root.z_index > 0,
+	_ck(qb2._root.custom_minimum_size.y >= 37 and qb2._root.z_index > 0,
 			"quickbar has a real bottom-anchor extent and stays above legacy HUD")
 	_ck(qb2._state[2].kind == "skill" and int(qb2._state[2].id) == 16, "quickslot 恢复：格2=技能16")
 	_ck(qb2._slots[2].icon.texture != null and qb2._slots[2].icon.visible,