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/chat/chat.tscn

@@ -1,7 +1,7 @@
 [gd_scene load_steps=12 format=3 uid="uid://chm6pv6pk735s"]
 
 [ext_resource type="Texture2D" uid="uid://crx2h62tpxlx3" path="res://assets/interface/left_bottom/chat_background.png" id="1_5ylo4"]
-[ext_resource type="Script" path="res://scripts/interface/chat/chat.gd" id="1_e45gj"]
+[ext_resource type="Script" uid="uid://b7ujupvh4d8vf" path="res://scripts/interface/chat/chat.gd" id="1_e45gj"]
 [ext_resource type="Texture2D" uid="uid://dtug2y7vy1kb1" path="res://assets/interface/left_bottom/input_background.png" id="2_ib2ff"]
 [ext_resource type="FontFile" uid="uid://sk3ot7ejjfpl" path="res://assets/common/font/HarmonyOS_Sans_Bold.ttf" id="3_ryrma"]
 [ext_resource type="Texture2D" uid="uid://c68mofgrsxwx7" path="res://assets/interface/left_bottom/right_button_0.png" id="4_t7w1q"]