perf(fonts): 优化字体加载性能并添加子集化脚本

将 TTF 字体转换为更高效的 WOFF2 格式，添加字体子集化脚本以减小文件大小
优化字体预加载和显示策略，改进无障碍标签

scripts/subset-font.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+"""简化的字体子集化脚本"""
+
+from fontTools.ttLib import TTFont
+from fontTools.subset import Subsetter
+import os
+
+# 读取字符
+with open('scripts/font-chars.txt', 'r', encoding='utf-8') as f:
+    text = f.read()
+    chars = set(text) - {'\n', '\r', '\t', ' '}
+
+print(f'📝 需要保留的字符数: {len(chars)}')
+
+# 加载字体
+input_font = 'public/fonts/AoyagiReisho.ttf'
+font = TTFont(input_font)
+original_size = os.path.getsize(input_font) / 1024 / 1024
+print(f'📊 原始字体大小: {original_size:.2f} MB')
+
+# 创建子集
+print('⚙️  正在创建字体子集...')
+subsetter = Subsetter()
+subsetter.populate(chars)
+subsetter.subset(font)
+
+# 保存 WOFF2
+output_woff2 = 'public/fonts/AoyagiReisho.woff2'
+print(f'💾 正在保存 WOFF2: {output_woff2}')
+font.flavor = 'woff2'
+font.save(output_woff2)
+font.close()
+
+# 统计
+new_size = os.path.getsize(output_woff2) / 1024 / 1024
+reduction = (1 - new_size / original_size) * 100
+
+print(f'\n✨ 优化完成!')
+print(f'📊 新字体大小: {new_size:.2f} MB')
+print(f'📉 减小比例: {reduction:.1f}%')
+print(f'💾 节省空间: {(original_size - new_size):.2f} MB')
+print(f'\n✅ 字体文件已保存到: {output_woff2}')