refactor(typo-generator): 调整词典文件路径获取方式以提高通用性

将 `dict.txt` 的路径获取方式从依赖 `rjieba` 包的相对路径改为基于项目根目录的相对路径。这避免了因 `rjieba` 包内部结构变化而导致路径失效的问题，增强了代码的健壮性和可移植性。

src/chat/utils/typo_generator.py

@@ -254,7 +254,8 @@ class ChineseTypoGenerator:
         all_combinations = itertools.product(*candidates)
 
         # 获取rjieba词典和词频信息
-        dict_path = os.path.join(os.path.dirname(rjieba.__file__), "dict.txt")
+        base_dir = os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
+        dict_path = os.path.join(base_dir, "depends-data", "dict.txt")
         valid_words = {}  # 改用字典存储词语及其频率
         with open(dict_path, encoding="utf-8") as f:
             for line in f: