fix(combat): 战斗逐项对齐 40250，修复移动 / 技能释放与武器挂点

- 连击类型由 combo_changed 驱动（SetComboSkillFlag，技能 122 等级）
- 命中判定改为 .msa 刀尖 Z 圆柱 vs .msm 防御球（hit_collision.gd 逐行移植）
- _register_hit 改为 map::insert 语义，修正命中上限
- 攻速同时缩放 GetAttackingElapsedTime 与攻击动作速率；按武器动作模式目录绑定攻击段
- 去掉本地连击超时，motion_bound 清命中表 / 连击段号
- __ProcessDataAttackSuccess：InsertDelay 硬直、physics_push.gd 击退 + GetBlendingPosition 同步、
  命中特效、__HitGood / __HitGreate / __HitStone 受击动作链与抖动（ui/hit_reaction.gd）
- ClassicSession::send_use_skill 不再夹带 CG_FLY_TARGETING
- mac 前进 / 后退方向与技能释放修复；武器按职业骨骼挂到手上
- 新增 hit_collision / physics_push / hit_view / net_world_push / weapon_attach 测试；
  gpu_pose_bounds / race_motion_assembly 适配 damage 随机变体
- 文档：CLIENT-GAP.md、CLIENT-GAP-FIX.md §3.5 / §3.7 与 C.5 增量 130

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ft3kXpNdLbKEfg5uDLfqVF

project/ui/mob_view.gd

@@ -21,11 +21,25 @@ const STATE_MOTIONS := {
 	"damage": ["FRONT_DAMAGE", "DAMAGE", "BACK_DAMAGE"],
 	"dead": ["FRONT_DEAD", "DEAD", "BACK_DEAD"],
 	"emotion": ["WAIT"],
+	# §3.7 受击动作步（motlist 名 -> NAME_DAMAGE_BACK / DAMAGE_FLYING(_BACK) / STAND_UP(_BACK)）。
+	# 不加别名：缺哪段就让 InterceptOnceMotion / PushOnceMotion 失败，与参考端一致。
+	"damage_back": ["BACK_DAMAGE"],
+	"knockdown": ["FRONT_KNOCKDOWN"],
+	"knockdown_back": ["BACK_KNOCKDOWN"],
+	"standup": ["FRONT_STANDUP"],
+	"standup_back": ["BACK_STANDUP"],
 }
+const HitReaction = preload("res://ui/hit_reaction.gd")
+const HitCollision = preload("res://hit_collision.gd")
+
+# CActorInstance::__SetMotion 尾：动作绑定完成。
+signal motion_bound(state: String)
 
 var model: Node          # Metin2Model
 var anim: Node           # Metin2AnimPlayer
 var _dir := ""
+var _mesh_stem := ""
+var _hit := HitReaction.new()
 var _motions := {}       # MOTION_NAME(String) -> 绝对 .msa 路径
 var _state := ""
 var _last_resolution := {}
@@ -89,6 +103,7 @@ func build(assets_root: String, proto: Node, race: int, pump := Callable()) -> b
 			break
 	if _dir == "":
 		return false
+	_mesh_stem = mesh_stem
 	var gr2 := _dir.path_join(mesh_stem + ".gr2")
 	if not FileAccess.file_exists(gr2):
 		gr2 = _dir.path_join(_dir.get_file() + ".gr2")   # 目录同名主网格
@@ -114,6 +129,8 @@ func build(assets_root: String, proto: Node, race: int, pump := Callable()) -> b
 		anim.set("model_path", NodePath("../Metin2Model"))
 		anim.set("blend_time", 0.15)
 		add_child(anim)
+		if anim.has_signal("playback_finished"):
+			anim.playback_finished.connect(_on_playback_finished)
 	set_anim_state("wait")
 	CharShadow.attach(self, 1.6)   # 怪脚印大一点
 	return true
@@ -125,15 +142,87 @@ func set_audio(audio_node: Node) -> void:
 func set_anim_state(s: String) -> void:
 	if s == _state or anim == null:
 		return
+	if HitReaction.is_reaction(s):
+		_hit.start([[s]], _state, _bind_reaction)
+		return
+	# 受击动作链播放中：循环动作请求留到链尾 PushLoopMotion 再回（seam：参考端动作队列）
+	if _hit.active and s in HitReaction.LOOP_STATES:
+		_hit.resume = s
+		return
+	_hit.cancel()
 	_state = s
 	_last_resolution = resolve_motion(s)
 	var msa := String(_last_resolution.path)
 	if msa == "":
 		# 旧客户端 GetMotionKey 失败时 SetLoopMotion/InterceptMotion 直接返回：保留当前动作。
 		return
-	anim.set("loop", s in ["wait", "walk", "run"])
-	anim.set("anim_path", msa)
-	_refresh_sound_script(msa)
+	_bind(s, msa, s in HitReaction.LOOP_STATES, 1.0)
+
+# CGraphicThingInstance::InsertDelay(fStiffenTime)
+func insert_delay(d: float) -> void:
+	_hit.insert_delay(d, anim)
+
+# CActorInstance::__HitGood / __HitGreate / __HitStone（ActorInstanceBattle.cpp）
+func hit_good(scalar: float, stunned: bool) -> void:
+	_hit.start(_hit.good(_state, scalar, stunned), _state, _bind_reaction)
+
+func hit_greate(scalar: float, stunned: bool) -> void:
+	_hit.start(_hit.greate(_state, scalar, stunned), _state, _bind_reaction, stunned)
+
+func hit_stone(stunned: bool) -> void:
+	_hit.stone(stunned)
+
+func is_in_hit_reaction() -> bool:
+	return _hit.active
+
+# 受击方防御球：怪目录的 .msm（<网格代号>.msm / <目录名>.msm / 目录里第一个 .msm）。
+func get_defending_spheres() -> Array:
+	if _dir == "":
+		return []
+	var cands: Array = []
+	if _mesh_stem != "":
+		cands.append(_dir.path_join(_mesh_stem + ".msm"))
+	cands.append(_dir.path_join(_dir.get_file() + ".msm"))
+	for p: String in cands:
+		if FileAccess.file_exists(p):
+			return HitCollision.parse_msm_defending(p)
+	var da := DirAccess.open(_dir)
+	if da:
+		for fn in da.get_files():
+			if fn.to_lower().ends_with(".msm"):
+				return HitCollision.parse_msm_defending(_dir.path_join(fn))
+	return []
+
+func _on_playback_finished() -> void:
+	if not _hit.active:
+		return
+	if _hit.advance(_bind_reaction) or _hit.real_dead:
+		return
+	_state = ""
+	set_anim_state(_hit.resume)
+
+func _bind_reaction(step: String) -> bool:
+	if anim == null:
+		return false
+	var r := resolve_motion(step)
+	_last_resolution = r
+	var msa := String(r.path)
+	if msa == "":
+		return false
+	_bind(step, msa, false, 1.0)
+	return true
+
+func _bind(state: String, path: String, loop: bool, speed_ratio: float) -> void:
+	if not HitReaction.is_reaction(state):
+		_hit.cancel()
+	_state = state
+	anim.set("loop", loop)
+	if not loop and String(anim.get("anim_path")) == path:
+		anim.set("anim_path", "")    # 同一段一次性动作再触发：先清，否则原生播放器视为无变化
+	anim.set("anim_path", path)
+	anim.set("time_scale", _hit.scale_for(speed_ratio))
+	_refresh_sound_script(path)
+	motion_bound.emit(state)
 
 # Read-only motion resolver used by the forest acceptance harness. Returning
 # the selected .msa before playback lets the test distinguish a real action
@@ -169,7 +258,8 @@ func resolve_motion(state: String) -> Dictionary:
 func last_motion_resolution() -> Dictionary:
 	return _last_resolution.duplicate()
 
-func _process(_delta: float) -> void:
+func _process(delta: float) -> void:
+	_hit.tick(delta, anim, model as Node3D)   # InsertDelay + ShakeProcess
 	if _audio == null or anim == null or _sound_instances.is_empty() or not anim.has_method("get_time") \
 			or not bool(anim.get("playing")):
 		return