fix: auto-fix code issues (cron)

- 修复隐式 Optional 类型注解 (RUF013)
- 修复不必要的赋值后返回 (RET504)
- 优化列表推导式 (PERF401)
- 修复未使用的参数 (ARG002)
- 清理重复导入
- 优化异常处理

backend/collaboration_manager.py

@@ -304,7 +304,7 @@ class CollaborationManager:
             )
             self.db.conn.commit()
 
-    def revoke_share_link(self, share_id: str, revoked_by: str) -> bool:
+    def revoke_share_link(self, share_id: str, _revoked_by: str) -> bool:
         """撤销分享链接"""
         if self.db:
             cursor = self.db.conn.cursor()
@@ -335,26 +335,24 @@ class CollaborationManager:
             (project_id,),
         )
 
-        shares = []
-        for row in cursor.fetchall():
-            shares.append(
-                ProjectShare(
-                    id=row[0],
-                    project_id=row[1],
-                    token=row[2],
-                    permission=row[3],
-                    created_by=row[4],
-                    created_at=row[5],
-                    expires_at=row[6],
-                    max_uses=row[7],
-                    use_count=row[8],
-                    password_hash=row[9],
-                    is_active=bool(row[10]),
-                    allow_download=bool(row[11]),
-                    allow_export=bool(row[12]),
-                ),
+        return [
+            ProjectShare(
+                id=row[0],
+                project_id=row[1],
+                token=row[2],
+                permission=row[3],
+                created_by=row[4],
+                created_at=row[5],
+                expires_at=row[6],
+                max_uses=row[7],
+                use_count=row[8],
+                password_hash=row[9],
+                is_active=bool(row[10]),
+                allow_download=bool(row[11]),
+                allow_export=bool(row[12]),
             )
-        return shares
+            for row in cursor.fetchall()
+        ]
 
     # ============ 评论和批注 ============
 
@@ -435,7 +433,10 @@ class CollaborationManager:
         self.db.conn.commit()
 
     def get_comments(
-        self, target_type: str, target_id: str, include_resolved: bool = True,
+        self,
+        target_type: str,
+        target_id: str,
+        include_resolved: bool = True,
     ) -> list[Comment]:
         """获取评论列表"""
         if not self.db:
@@ -461,10 +462,7 @@ class CollaborationManager:
                 (target_type, target_id),
             )
 
-        comments = []
-        for row in cursor.fetchall():
-            comments.append(self._row_to_comment(row))
-        return comments
+        return [self._row_to_comment(row) for row in cursor.fetchall()]
 
     def _row_to_comment(self, row) -> Comment:
         """将数据库行转换为Comment对象"""
@@ -554,7 +552,10 @@ class CollaborationManager:
         return cursor.rowcount > 0
 
     def get_project_comments(
-        self, project_id: str, limit: int = 50, offset: int = 0,
+        self,
+        project_id: str,
+        limit: int = 50,
+        offset: int = 0,
     ) -> list[Comment]:
         """获取项目下的所有评论"""
         if not self.db:
@@ -571,10 +572,7 @@ class CollaborationManager:
             (project_id, limit, offset),
         )
 
-        comments = []
-        for row in cursor.fetchall():
-            comments.append(self._row_to_comment(row))
-        return comments
+        return [self._row_to_comment(row) for row in cursor.fetchall()]
 
     # ============ 变更历史 ============
 
@@ -697,10 +695,7 @@ class CollaborationManager:
                 (project_id, limit, offset),
             )
 
-        records = []
-        for row in cursor.fetchall():
-            records.append(self._row_to_change_record(row))
-        return records
+        return [self._row_to_change_record(row) for row in cursor.fetchall()]
 
     def _row_to_change_record(self, row) -> ChangeRecord:
         """将数据库行转换为ChangeRecord对象"""