feat(api): op-login 游戏内审批先展示目标账号、邮箱与发起来源，须输入账户名确认，velocity 显示审批卡片

internal/store/migrations/0030_op_login_origin.sql

@@ -0,0 +1,8 @@
+-- Where an op.console sign-in was started. The in-game admin sees it before
+-- vouching (/felis web op approve <code>), next to the account name and
+-- address, so a request started from an unfamiliar network or browser can be
+-- turned down. Recorded once, at start; rows from before this migration show
+-- blanks.
+ALTER TABLE op_login_requests
+  ADD COLUMN client_ip text NOT NULL DEFAULT '',
+  ADD COLUMN user_agent text NOT NULL DEFAULT '';