refactor(core): 统一代码风格并移除未使用的导入

本次提交主要进行代码风格的统一和现代化改造，具体包括：
- 使用 `|` 联合类型替代 `typing.Optional`，以符合 PEP 604 的现代语法。
- 移除多个文件中未被使用的导入语句，清理代码。
- 调整了部分日志输出的级别，使其更符合调试场景。
- 统一了部分文件的导入顺序和格式。

src/plugin_system/services/relationship_service.py

@@ -4,7 +4,6 @@
 """
 
 import time
-from typing import Optional
 
 from src.common.database.sqlalchemy_models import UserRelationships, get_db_session
 from src.common.logger import get_logger
@@ -110,7 +109,7 @@ class RelationshipService:
                 "user_name": ""
             }
 
-    async def update_user_relationship(self, user_id: str, relationship_score: float, relationship_text: Optional[str] = None, user_name: Optional[str] = None):
+    async def update_user_relationship(self, user_id: str, relationship_score: float, relationship_text: str | None = None, user_name: str | None = None):
         """
         更新用户关系数据
 
@@ -160,7 +159,7 @@ class RelationshipService:
         except Exception as e:
             logger.error(f"更新用户关系失败: {user_id}, 错误: {e}")
 
-    def _get_from_cache(self, user_id: str) -> Optional[dict]:
+    def _get_from_cache(self, user_id: str) -> dict | None:
         """从缓存获取数据"""
         if user_id in self._cache:
             cached_data = self._cache[user_id]
@@ -179,7 +178,7 @@ class RelationshipService:
             "last_updated": time.time()
         }
 
-    async def _fetch_from_database(self, user_id: str) -> Optional[UserRelationships]:
+    async def _fetch_from_database(self, user_id: str) -> UserRelationships | None:
         """从数据库获取关系数据"""
         try:
             async with get_db_session() as session:
@@ -217,7 +216,7 @@ class RelationshipService:
             "cache_keys": list(self._cache.keys())
         }
 
-    def clear_cache(self, user_id: Optional[str] = None):
+    def clear_cache(self, user_id: str | None = None):
         """清理缓存"""
         if user_id:
             if user_id in self._cache:
@@ -229,4 +228,4 @@ class RelationshipService:
 
 
 # 创建全局实例
-relationship_service = RelationshipService()
+relationship_service = RelationshipService()