feat(adminui): B2-WP6 browse re-target — /raw device browse commits raw tags

Browse device… on a /raw Device/TagGroup opens the discovery-browser modal
against the merged Driver+Device config and commits selected browse leaves as
raw Tag rows under the target, via IRawTreeService.ImportTagsAsync.

- RawBrowseModal.razor: two-tier browse gate (bespoke IDriverBrowser →
  universal DiscoveryDriverBrowser via SupportsOnlineDiscovery → disabled),
  merged config from LoadMergedProbeConfigAsync, multi-select over
  DriverBrowseTree, opt-in 'create matching tag-groups' folder mirror,
  commit via ImportTagsAsync.
- RawBrowseCommitMapper: pure leaf→RawTagImportRow mapper — DriverDataType→
  OPC UA type, per-driver address field (nodeId/tagPath/symbolPath/address/
  attributeRef), target-group + mirror path combine. Unit-tested (39 tests).
- DriverBrowseTree: additive multi-select mode (checkboxes + ancestor-path
  callback), default off preserves single-select pickers.
- RawTree: OnBrowseDevice wired to the modal (Device + TagGroup menus).

Claude-Session: https://claude.ai/code/session_01LVneM3eh1UtJxEisFXgmox

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Browsing/BrowseLeafSelection.cs

@@ -0,0 +1,13 @@
+using ZB.MOM.WW.OtOpcUa.Commons.Browsing;
+
+namespace ZB.MOM.WW.OtOpcUa.AdminUI.Browsing;
+
+/// <summary>
+///     Payload for a leaf toggle in <c>DriverBrowseTree</c>'s multi-select mode (WP6 "Browse device…"
+///     re-target). Carries the toggled <see cref="Leaf"/> plus the captured browse-folder nesting above it
+///     (<see cref="FolderPath"/>, root→parent display names) so the browse modal can optionally mirror the
+///     nesting onto TagGroups on commit. Fired only for <see cref="BrowseNodeKind.Leaf"/> nodes.
+/// </summary>
+/// <param name="Leaf">The toggled leaf browse node (its <c>NodeId</c> is the driver full reference).</param>
+/// <param name="FolderPath">The ancestor folder display names, root→parent (empty for a top-level leaf).</param>
+public sealed record BrowseLeafSelection(BrowseNode Leaf, IReadOnlyList<string> FolderPath);