feat(角色): 添加Gobo角色及相关资源

添加Gobo角色，包括武器、召唤物和治疗导弹功能
- 新增Gobo角色模型和动画资源
- 实现Gobo武器系统，可召唤Gobo单位
- 添加治疗导弹功能，Gobo受伤时会发射治疗友军
- 优化实体基础类，添加生命值初始化方法
- 修改子弹伤害判定逻辑，支持友军伤害设置

components/Bullets/HealingMissle.tscn

@@ -0,0 +1,27 @@
+[gd_scene load_steps=5 format=3 uid="uid://ds6yxgj6r8f4v"]
+
+[ext_resource type="PackedScene" uid="uid://crtdkysmnkith" path="res://components/Abstracts/BulletBase.tscn" id="1_1wl5l"]
+[ext_resource type="Texture2D" uid="uid://dpvk6pja35rdb" path="res://resources/items/apple-white.png" id="2_0jb7f"]
+[ext_resource type="Script" uid="uid://d2ubbdwexom6t" path="res://scripts/Contents/Bullets/HealingMissle.gd" id="2_nxr84"]
+
+[sub_resource type="SpriteFrames" id="SpriteFrames_nxr84"]
+animations = [{
+"frames": [{
+"duration": 1.0,
+"texture": ExtResource("2_0jb7f")
+}],
+"loop": true,
+"name": &"default",
+"speed": 5.0
+}]
+
+[node name="HealingMissle" instance=ExtResource("1_1wl5l")]
+script = ExtResource("2_nxr84")
+speed = 1.0
+lifeTime = 5000.0
+allowFriendlyDamage = true
+
+[node name="texture" parent="." index="0"]
+modulate = Color(0.0068707466, 1, 0, 1)
+scale = Vector2(0.44360867, 0.44360867)
+sprite_frames = SubResource("SpriteFrames_nxr84")