feat(cookies): CK 有效性检测(双接口) + 结果持久化

- 检测: 鱼丸余额(fishBall) + 用户等级(userLevelDetail)双接口均通过才判有效,
  附带鱼丸数/昵称/等级, 失败时分别说明原因, 8 并发批量检测
- 持久化: login_tasks 新增 ck_check_status/ck_check_result/ck_checked_at,
  刷新翻页不丢失; 列表与详情接口返回检测字段
- 前端: 新增"有效性"列(有效/无效+鱼丸昵称tooltip)与独立"检测时间"列,
  行内/选中批量检测按钮(cookie:view 权限), 加载时初始化历史检测结果

web/backend/migrations/versions/20260807_0018_cookie_check_fields.py

@@ -0,0 +1,41 @@
+"""斗鱼 Cookie 有效性检测结果持久化字段
+
+Revision ID: 20260807_0018
+Revises: 20260807_0017
+Create Date: 2026-08-07
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = "20260807_0018"
+down_revision: Union[str, None] = "20260807_0017"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    bind = op.get_bind()
+    if not sa.inspect(bind).has_table("login_tasks"):
+        return
+    columns = {column["name"] for column in sa.inspect(bind).get_columns("login_tasks")}
+    for column in [
+        sa.Column("ck_check_status", sa.String(length=16), nullable=True),
+        sa.Column("ck_check_result", sa.JSON(), nullable=True),
+        sa.Column("ck_checked_at", sa.DateTime(), nullable=True),
+    ]:
+        if column.name not in columns:
+            op.add_column("login_tasks", column)
+
+
+def downgrade() -> None:
+    bind = op.get_bind()
+    if not sa.inspect(bind).has_table("login_tasks"):
+        return
+    columns = {column["name"] for column in sa.inspect(bind).get_columns("login_tasks")}
+    for column_name in ["ck_checked_at", "ck_check_result", "ck_check_status"]:
+        if column_name in columns:
+            op.drop_column("login_tasks", column_name)