perf(font): 优化字体渲染并添加抗锯齿设置

- 在所有字体文件中添加 keep_rounding_remainders 属性，提高字体渲染质量
- 更新项目设置，启用抗锯齿功能
- 调整场景文件中的资源引用，添加 UID 信息

engine/scenes/interface/panel/panel.tscn

@@ -1,6 +1,6 @@
 [gd_scene load_steps=28 format=3 uid="uid://dnmr3dnb6sud2"]
 
-[ext_resource type="Script" path="res://scripts/interface/panel/panel.gd" id="1_7mmba"]
+[ext_resource type="Script" uid="uid://bfa3uw2nlo8br" path="res://scripts/interface/panel/panel.gd" id="1_7mmba"]
 [ext_resource type="Texture2D" uid="uid://m8ayino6otwq" path="res://assets/interface/panel/panel_background.png" id="1_fq3jh"]
 [ext_resource type="Texture2D" uid="uid://bv1y2ps3ar3xn" path="res://assets/interface/common/close_button_0.png" id="2_6hlmw"]
 [ext_resource type="Texture2D" uid="uid://dajrp5tujblkg" path="res://assets/interface/common/close_button_1.png" id="3_obsyn"]