feat(ui): Battle.Net 序列号/恢复码展示 + 热键复制确认

- dialog_bnet_info.go: 新增 Battle.Net 信息对话框，显示序列号
  和恢复码，支持一键复制恢复码
- row_menu: 新增 rowActionBnetInfo 动作，仅对 Battle.Net 条目可见
- 热键行为确认：autoType 已自动复制到剪贴板 + 键入前台窗口
- i18n: action_bnet_info / dialog_bnet_info_title / bnet_info_intro
  / hint_bnet_restore_code_secret 三语翻译

internal/ui/row_menu.go

@@ -19,6 +19,7 @@ const (
 	rowActionMoveUp
 	rowActionMoveDown
 	rowActionChangeIcon
+	rowActionBnetInfo
 )
 
 // rowActionMenu is the small popup opened by the ⋯ button on each entry
@@ -29,20 +30,23 @@ type rowActionMenu struct {
 	idx         int
 	canMoveUp   bool
 	canMoveDown bool
+	isBnet      bool
 
 	renameBtn     widget.Clickable
 	deleteBtn     widget.Clickable
 	moveUpBtn     widget.Clickable
 	moveDownBtn   widget.Clickable
 	changeIconBtn widget.Clickable
+	bnetInfoBtn   widget.Clickable
 	cancelBtn     widget.Clickable
 }
 
-func newRowActionMenu(idx, total int) *rowActionMenu {
+func newRowActionMenu(idx, total int, vendor string) *rowActionMenu {
 	return &rowActionMenu{
 		idx:         idx,
 		canMoveUp:   idx > 0,
 		canMoveDown: idx < total-1,
+		isBnet:      vendor == "battlenet",
 	}
 }
 
@@ -107,6 +111,7 @@ func (m *rowActionMenu) Layout(gtx layout.Context, th *material.Theme) layout.Di
 					row(&m.renameBtn, i18n.T("action_rename"), true),
 					row(&m.deleteBtn, i18n.T("action_delete"), true),
 					row(&m.changeIconBtn, i18n.T("action_change_icon"), true),
+					row(&m.bnetInfoBtn, i18n.T("action_bnet_info"), m.isBnet),
 					row(&m.moveUpBtn, i18n.T("action_move_up"), m.canMoveUp),
 					row(&m.moveDownBtn, i18n.T("action_move_down"), m.canMoveDown),
 					layout.Rigid(layout.Spacer{Height: unit.Dp(8)}.Layout),