fix(book): 修复文件名合法性检查问题

- 添加了去除文件名末尾空格和点号的功能
- 确保文件名不会以非法字符结尾

app/services/book_service.py

@@ -51,6 +51,7 @@ class BookService:
     @staticmethod
     def legitimate_naming(name: str) -> str:
         """将文件名中的非法字符替换为合法字符"""
+        name = name.rstrip(" .")
         replacements = {":": "：", "<": "《", ">": "》", "/": " ", "\\": " ", "?": "？"}
         for old, new in replacements.items():
             name = name.replace(old, new)