feat: 实现时间流动完整逻辑并同步 HUD 显示

- TimeSystem 支持月/年进位，仅游戏场景推进
- HUD 时间标签订阅 day_passed 实时更新
- 新游戏时重置年月日

src/UI/HUD/TopBarHUD.tscn

@@ -5,6 +5,7 @@
 
 [sub_resource type="LabelSettings" id="LabelSettings_bn2o5"]
 font = ExtResource("1_pa2rn")
+font_size = 32
 
 [node name="TopBarHud" type="Control" unique_id=1115394694]
 layout_mode = 3
@@ -46,6 +47,7 @@ label_settings = SubResource("LabelSettings_bn2o5")
 layout_mode = 2
 size_flags_horizontal = 3
 size_flags_vertical = 8
+size_flags_stretch_ratio = 2.0
 label_settings = SubResource("LabelSettings_bn2o5")
 
 [node name="Label_Reputation" type="Label" parent="HBoxContainer" unique_id=985110673]

src/UI/HUD/top_bar_hud.gd

@@ -10,7 +10,12 @@ func _ready() -> void:
 	for i in SPEED_BUTTONS.size():
 		var btn: Button = $HBoxContainer/SpeedGroup.get_node(SPEED_BUTTONS[i])
 		btn.button_up.connect(_on_speed_button_up.bind(i))
+	TimeSystem.day_passed.connect(_on_day_passed)
 	_update_speed_ui()
+	$HBoxContainer/Value_Time.text = TimeSystem.get_date_text()
+
+func _on_day_passed(_year: int, _month: int, _day: int) -> void:
+	$HBoxContainer/Value_Time.text = TimeSystem.get_date_text()
 
 func _on_button_return_button_up() -> void:
 	sign_return_mainmenu.emit()

src/UI/Panels/MainMenu/MainMenu.gd

@@ -1,8 +1,8 @@
 extends Control
 
 func MainMenu_NewGame_ButtonUp() -> void:
+	GameState.request_new_game()
 	get_tree().change_scene_to_file("res://src/Core/MainGame.tscn")
-	pass # Replace with function body.
 
 
 func MainMenu_LoadGame_ButtonUp() -> void: