feat: 添加角色选择系统及相关功能

新增角色卡片组件和角色选择逻辑
实现角色卡片动画效果和交互功能
添加初始角色数据配置
修改启动面板以支持角色选择
更新主题样式和UI布局

scripts/Structs/Character.gd

@@ -0,0 +1,54 @@
+@tool
+extends Control
+class_name CharacterCard
+
+signal select()
+
+@export var displayName: String = "Unknown Character"
+@export var avatar: Texture2D = null
+@export_multiline var description: String = ""
+@export var fields: Array[FieldStore.Entity] = []
+@export var fieldValues: Array[float] = []
+@export var clickToRebuild: bool = false
+@export var borderOpacity: float = 0
+
+@onready var panel: PanelContainer = $%panel
+@onready var avatarTexture: TextureRect = $%avatarTexture
+@onready var nameLebel: Label = $%nameLabel
+@onready var descriptionLabel: Label = $%descriptionLabel
+@onready var fieldsBox: Control = $%fields
+@onready var animator: AnimationPlayer = $%animator
+
+var watcher: Watcher = Watcher.new(false)
+@onready var panelStyleBox: StyleBoxFlat = panel.get_theme_stylebox("panel").duplicate()
+
+func _ready():
+	panel.add_theme_stylebox_override("panel", panelStyleBox)
+	watcher.changed.connect(rebuildInfo)
+	gui_input.connect(
+		func(event):
+			if event is InputEventMouseButton:
+				if !(event.pressed && event.button_index == MouseButton.MOUSE_BUTTON_LEFT): return
+				if animator.is_playing(): return
+				select.emit()
+	)
+	rebuildInfo()
+func _process(_delta):
+	watcher.setState(clickToRebuild)
+	panelStyleBox.border_width_top = int(10 * borderOpacity)
+	panelStyleBox.border_width_bottom = int(10 * borderOpacity)
+
+func rebuildInfo():
+	avatarTexture.texture = avatar
+	nameLebel.text = displayName
+	descriptionLabel.text = description
+	for child in fieldsBox.get_children():
+		fieldsBox.remove_child(child)
+	for index in len(fields):
+		var field = fields[index]
+		var value = fieldValues[index]
+		var fieldShow = ComponentManager.getUIComponent("FieldShow").instantiate() as FieldShow
+		fieldShow.field = field
+		fieldShow.showAdvantage = true
+		fieldShow.value = value
+		fieldsBox.add_child(fieldShow)