feat: 新增角色系统及基础功能实现

新增HCN、Lynx和MuyangDog三个可玩角色及其相关资源
实现角色选择界面和角色属性系统
重构玩家生成逻辑以支持角色选择
优化角色卡片UI显示效果

scripts/Structs/Character.gd

@@ -5,6 +5,7 @@ class_name CharacterCard
 signal select()
 
 @export var displayName: String = "Unknown Character"
+@export var slogan: String = "Slogan"
 @export var avatar: Texture2D = null
 @export_multiline var description: String = ""
 @export var fields: Array[FieldStore.Entity] = []
@@ -14,6 +15,7 @@ signal select()
 
 @onready var avatarTexture: TextureRect = $%avatarTexture
 @onready var nameLebel: Label = $%nameLabel
+@onready var sloganLabel: Label = $%sloganLabel
 @onready var descriptionLabel: Label = $%descriptionLabel
 @onready var fieldsBox: Control = $%fields
 @onready var animator: AnimationPlayer = $%animator
@@ -40,6 +42,7 @@ func _process(_delta):
 func rebuildInfo():
 	avatarTexture.texture = avatar
 	nameLebel.text = displayName
+	sloganLabel.text = "“%s”" % slogan
 	descriptionLabel.text = description
 	for child in fieldsBox.get_children():
 		fieldsBox.remove_child(child)