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/Bullets/MagicMissle.gd

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+extends BulletBase
+class_name MagicMissleBullet
+
+var powerScale: int = 3
+var speedV2: Vector2 = Vector2.ZERO
+var accelerating: bool = true
+var roundBullets: Array[MagicMissleBullet]
+
+func ai():
+	if accelerating:
+		rotation = lerp_angle(rotation, position.angle_to_point(get_global_mouse_position()), 0.1)
+		speedV2 += (get_global_mouse_position() - position).normalized() * 1
+	elif speed < 1:
+		tryDestroy()
+	speedV2 *= 0.995
+	speed = speedV2.length()
+	PresetBulletAI.forward(self , speedV2.angle())
+
+func succeedToHit(_dmg: float, entity: EntityBase):
+	if powerScale > 0 && accelerating && roundBullets.count(self ) > 0:
+		for i in randi_range(1, powerScale):
+			for bullet in BulletBase.generate(
+				ComponentManager.getBullet("MagicMissle"),
+				launcher,
+				position,
+				entity.position.angle_to_point(position) + PI + randf_range(-1, 1) * deg_to_rad(60)
+			):
+				if bullet is MagicMissleBullet:
+					bullet.position += Vector2.from_angle(bullet.rotation) * 100
+					bullet.speedV2 += Vector2.from_angle(bullet.rotation) * 30
+					bullet.roundBullets = roundBullets
+					bullet.powerScale = powerScale - 1
+					roundBullets.append(bullet)
+		powerScale = 0

scripts/Contents/Bullets/MagicMissle.gd.uid

@@ -0,0 +1 @@
+uid://b1y8r5xrhhso