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/app.go

@@ -127,6 +127,7 @@ type appState struct {
 	renameDlg     *renameDialog
 	confirmDelDlg *confirmDeleteDialog
 	iconPickerDlg *iconPickerDialog
+	bnetInfoDlg   *bnetInfoDialog
 	rowTargetIdx  int
 
 	store   *store
@@ -497,7 +498,13 @@ func drawFrame(gtx layout.Context, th *material.Theme, st *appState, w *app.Wind
 		total := len(st.entries)
 		st.mu.Unlock()
 		st.rowTargetIdx = moreTargetIdx
-		st.rowMenu = newRowActionMenu(moreTargetIdx, total)
+		vendor := ""
+		st.mu.Lock()
+		if moreTargetIdx >= 0 && moreTargetIdx < len(st.entries) {
+			vendor = st.entries[moreTargetIdx].Auth.Name()
+		}
+		st.mu.Unlock()
+		st.rowMenu = newRowActionMenu(moreTargetIdx, total, vendor)
 	}
 
 	// First-run welcome dialog. Routed before all other dialogs so the
@@ -743,6 +750,14 @@ func drawFrame(gtx layout.Context, th *material.Theme, st *appState, w *app.Wind
 				}
 				st.mu.Unlock()
 				st.iconPickerDlg = newIconPickerDialog(current)
+			case rowActionBnetInfo:
+				st.mu.Lock()
+				if idx >= 0 && idx < len(st.entries) {
+					if bn, ok := st.entries[idx].Auth.(*authenticator.BattleNetAuthenticator); ok {
+						st.bnetInfoDlg = newBnetInfoDialog(bn)
+					}
+				}
+				st.mu.Unlock()
 			}
 			w.Invalidate()
 		} else {