fix: 优化字体子集化脚本，确保特殊字符不丢失

- 添加特殊字符检测
- 强制添加缺失的特殊字符
- 增强调试信息

scripts/subset-font-safe.py

@@ -151,8 +151,16 @@ def main():
     existing_chars = set()
     if os.path.exists(chars_file):
         with open(chars_file, 'r', encoding='utf-8') as f:
-            existing_chars = set(f.read())
+            content = f.read()
+            existing_chars = set(content)
         print(f"📖 读取现有字符: {len(existing_chars)} 个")
+
+        # 检查特殊字符是否存在
+        special_chars = ['—', '庶', '尉', '谏', '簿', '丞']
+        found_special = [c for c in special_chars if c in existing_chars]
+        print(f"🔍 检查特殊字符: {len(found_special)}/{len(special_chars)} 个已存在")
+        if found_special:
+            print(f"   已找到: {''.join(found_special)}")
     else:
         print(f"⚠️  现有字符文件不存在，将创建新文件")
 
@@ -177,6 +185,16 @@ def main():
     all_chars = existing_chars | new_chars
     print(f"📊 合并后字符数: {len(all_chars)}")
 
+    # 验证特殊字符是否在合并后的字符集中
+    special_chars = ['—', '庶', '尉', '谏', '簿', '丞']
+    missing_special = [c for c in special_chars if c not in all_chars]
+    if missing_special:
+        print(f"⚠️  警告：以下特殊字符不在合并后的字符集中: {''.join(missing_special)}")
+        print(f"   将强制添加这些字符...")
+        all_chars.update(special_chars)
+    else:
+        print(f"✅ 所有特殊字符都已保留在字符集中")
+
     if len(all_chars) == 0:
         print("❌ 未找到任何字符，请检查扫描目录")
         sys.exit(1)