feat: add basic UI scenes (card, hand, training room, main menu)

src/ui/scenes/main_menu.gd

@@ -0,0 +1,13 @@
+extends Control
+
+func _ready() -> void:
+	var start_btn := $VBoxContainer/StartButton as Button
+	var quit_btn := $VBoxContainer/QuitButton as Button
+	start_btn.pressed.connect(_on_start_pressed)
+	quit_btn.pressed.connect(_on_quit_pressed)
+
+func _on_start_pressed() -> void:
+	get_tree().change_scene_to_file("res://src/ui/scenes/training_room.tscn")
+
+func _on_quit_pressed() -> void:
+	get_tree().quit()

src/ui/scenes/main_menu.tscn

@@ -0,0 +1,17 @@
+[gd_scene load_steps=2 format=3 uid="uid://main_menu"]
+[ext_resource type="Script" path="res://src/ui/scenes/main_menu.gd" id="1_script"]
+[node name="MainMenu" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+script = ExtResource("1_script")
+[node name="VBoxContainer" type="VBoxContainer" parent="."]
+layout_mode = 1
+anchors_preset = 8
+offset_left = 300.0
+offset_top = 200.0
+offset_right = 500.0
+offset_bottom = 400.0
+[node name="StartButton" type="Button" parent="VBoxContainer"]
+text = "开始训练"
+[node name="QuitButton" type="Button" parent="VBoxContainer"]
+text = "退出"

src/ui/scenes/training_room.gd

@@ -0,0 +1,70 @@
+extends Control
+
+var controller: TrainingController
+
+@onready var hand_area: Node = $HandArea
+@onready var play_button: Button = $Buttons/PlayButton
+@onready var pass_button: Button = $Buttons/PassButton
+@onready var hint_button: Button = $Buttons/HintButton
+@onready var status_label: Label = $StatusLabel
+
+func _ready() -> void:
+	hand_area.training_controller = controller
+	play_button.pressed.connect(_on_play_pressed)
+	pass_button.pressed.connect(_on_pass_pressed)
+	hint_button.pressed.connect(_on_hint_pressed)
+
+func start_training() -> void:
+	controller = TrainingController.new()
+	controller.start_game(Config.rule_config, 0)
+	controller.turn_ready.connect(_on_turn_ready)
+	controller.state_changed.connect(_refresh_ui)
+	controller.game_ended.connect(_on_game_ended)
+	_refresh_ui()
+
+func _on_turn_ready(player_idx: int, is_human: bool) -> void:
+	if is_human:
+		hand_area.enable_input()
+		status_label.text = "你的回合"
+	else:
+		hand_area.disable_input()
+		status_label.text = "%s 思考中..." % controller.game_state.player_names[player_idx]
+
+func _on_play_pressed() -> void:
+	var selected := hand_area.selected_cards
+	if selected.is_empty():
+		return
+	var result := controller.handle_human_play(selected)
+	if not result.ok:
+		status_label.text = "无效出牌"
+		return
+	hand_area.clear_selection()
+	_refresh_ui()
+
+func _on_pass_pressed() -> void:
+	var result := controller.handle_human_pass()
+	if not result.ok:
+		status_label.text = "不能过牌"
+		return
+	_refresh_ui()
+
+func _on_hint_pressed() -> void:
+	var hint := controller.get_hint()
+	if hint == null or hint.type == -1:
+		status_label.text = "建议：过牌"
+		return
+	hand_area.clear_selection()
+	for card in hint.cards:
+		for cn in hand_area.card_nodes:
+			if cn.card_data != null and cn.card_data.card_id == card.card_id:
+				cn.set_selected(true)
+				hand_area.selected_cards.append(card)
+	status_label.text = "建议牌型: %s (rank=%d)" % [hint.type, hint.primary_rank]
+
+func _on_game_ended(winner_team: int, reason: String) -> void:
+	status_label.text = "游戏结束! 队伍 %d 获胜" % winner_team
+	hand_area.disable_input()
+
+func _refresh_ui() -> void:
+	if controller and controller.game_state:
+		hand_area.update_hand(controller.game_state.get_hand(0))

src/ui/scenes/training_room.tscn

@@ -0,0 +1,28 @@
+[gd_scene load_steps=2 format=3 uid="uid://training_room"]
+[ext_resource type="Script" path="res://src/ui/scenes/training_room.gd" id="1_script"]
+[node name="TrainingRoom" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+script = ExtResource("1_script")
+[node name="StatusLabel" type="Label" parent="."]
+layout_mode = 0
+offset_right = 400.0
+offset_bottom = 50.0
+text = "掼蛋训练模式"
+horizontal_alignment = 1
+[node name="HandArea" type="HBoxContainer" parent="."]
+layout_mode = 0
+offset_top = 500.0
+offset_right = 800.0
+offset_bottom = 650.0
+[node name="Buttons" type="HBoxContainer" parent="."]
+layout_mode = 0
+offset_top = 660.0
+offset_right = 800.0
+offset_bottom = 720.0
+[node name="PlayButton" type="Button" parent="Buttons"]
+text = "出牌"
+[node name="PassButton" type="Button" parent="Buttons"]
+text = "过牌"
+[node name="HintButton" type="Button" parent="Buttons"]
+text = "提示"