feat(web): 虎牙账号管理界面优化 — 登录渠道区分 (Web 旧版 / App 协议 / 短信)

后端:
- HuyaAccount 新增 login_channel 字段 + 迁移 20260829_0030 (启动自动升级)
- 5 个登录端点成功后记录渠道: web/app 批量与单账号 + 短信
- HuyaAccountOut 输出 login_channel
前端:
- 账号表新增『登录渠道』列 (App 协议/Web 旧版/短信/仅导入)
- 工具栏登录按钮分组: App 协议登录(primary 推荐) 与 Web 登录(旧版, Tooltip 说明)
- 行内操作新增单账号 App/Web 登录按钮 (复用批量端点传单 id)
- tsc + vite build 通过

web/backend/migrations/versions/20260829_0030_huya_login_channel.py

@@ -0,0 +1,45 @@
+"""虎牙账号增加登录渠道字段 (区分 Web 旧版 / App 协议登录)。
+
+Revision ID: 20260829_0030
+Revises: 20260814_0029
+Create Date: 2026-08-29
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = "20260829_0030"
+down_revision: Union[str, None] = "20260814_0029"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """huya_accounts 新增 login_channel (上次成功登录渠道)。"""
+    bind = op.get_bind()
+    inspector = sa.inspect(bind)
+    if not inspector.has_table("huya_accounts"):
+        return
+    columns = {column["name"] for column in inspector.get_columns("huya_accounts")}
+    if "login_channel" not in columns:
+        op.add_column("huya_accounts", sa.Column("login_channel", sa.String(16), nullable=False, server_default=""))
+    indexes = {index["name"] for index in inspector.get_indexes("huya_accounts")}
+    if "ix_huya_accounts_login_channel" not in indexes:
+        op.create_index("ix_huya_accounts_login_channel", "huya_accounts", ["login_channel"])
+
+
+def downgrade() -> None:
+    """移除 login_channel 字段。"""
+    bind = op.get_bind()
+    inspector = sa.inspect(bind)
+    if not inspector.has_table("huya_accounts"):
+        return
+    indexes = {index["name"] for index in inspector.get_indexes("huya_accounts")}
+    if "ix_huya_accounts_login_channel" in indexes:
+        op.drop_index("ix_huya_accounts_login_channel", table_name="huya_accounts")
+    columns = {column["name"] for column in inspector.get_columns("huya_accounts")}
+    if "login_channel" in columns:
+        op.drop_column("huya_accounts", "login_channel")