feat(武器系统): 添加魔法导弹武器及配套子弹逻辑

实现魔法导弹武器系统，包括：
1. 新增HOLD_LOOP发射类型武器
2. 添加魔法导弹子弹类实现追踪和分裂逻辑
3. 修改武器基类支持循环攻击模式
4. 更新角色控制器支持新武器类型
5. 添加相关资源文件和配置

scripts/Contents/Weapons/MagicMissle.gd

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+@tool
+extends Weapon
+
+var roundBullets: Array[MagicMissleBullet] = []
+
+func update(to: int, origin: Dictionary, _entity: EntityBase):
+	origin["atk"] += 1 * to * soulLevel
+	origin["cursor-m"] += 0.2 * to * soulLevel
+	origin["missle-m"] += 0.02 * to * soulLevel
+	origin["track"] += 1 * to * soulLevel
+	origin["G"] *= 1.25 ** (soulLevel - 1)
+	origin["count"] += 1 * (soulLevel - 1)
+	return origin
+
+func loopStart(entity: EntityBase):
+	for i in randi_range(1, readStore("count")):
+		for bullet in BulletBase.generate(
+			ComponentManager.getBullet("MagicMissle"),
+			entity,
+			get_global_mouse_position() + Vector2.from_angle(randf_range(0, 2 * PI)) * readStore("track"),
+			0
+		):
+			if bullet is MagicMissleBullet:
+				bullet.look_at(get_global_mouse_position())
+				bullet.rotation += PI / 2
+				bullet.speedV2 += Vector2.from_angle(bullet.rotation) * sqrt((readStore("G") * readStore("cursor-m") / readStore("track") ** 2) * readStore("track")) / 120
+				bullet.roundBullets = roundBullets
+				bullet.baseDamage = readStore("atk")
+				bullet.powerScale = readStore("count")
+				roundBullets.append(bullet)
+	return true
+func loopExit(_entity: EntityBase):
+	for bullet in roundBullets:
+		if is_instance_valid(bullet):
+			bullet.accelerating = false
+	roundBullets.clear()

scripts/Contents/Weapons/MagicMissle.gd.uid

@@ -0,0 +1 @@
+uid://clec7nrtesipu