feat(adminui): B2-WP5 CSV tag import/export + review grid

Staged CSV tag import (upload -> parse -> review grid with per-row verdicts
-> all-or-nothing commit) and export for the /raw tree Device/TagGroup.

- CsvColumnMap: per-driver typed column <-> TagConfig JSON maps (model-backed
  for the 7 typed drivers, raw-key for Galaxy/Calculation) + the common column
  dictionary; typed columns merge OVER the TagConfigJson fallback (typed wins).
- RawTagCsvMapper: pure parse (review rows + verdicts + typed/fallback
  provenance + intra-batch dup detection) and export (residual TagConfigJson)
  over the T0-2 CsvParser/CsvWriter.
- RawTagCsvExportReader: DbContext-backed read helper (no IRawTreeService
  extension) enumerating a device's tags + reconstructing group paths.
- RawCsvImportModal + RawCsvExportModal (data-URI download).
- Reflection guard test (typed column -> real model property + batch-plan
  dictionary parity) + export->import round-trip property test.

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

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/EndpointRouteBuilderExtensions.cs

@@ -49,6 +49,8 @@ public static class EndpointRouteBuilderExtensions
         services.AddScoped<Browsing.IBrowserSessionService, Browsing.BrowserSessionService>();
         services.AddScoped<IUnsTreeService, UnsTreeService>();
         services.AddScoped<IRawTreeService, RawTreeService>();
+        // WP5 CSV export enumeration (read-only; does not extend the closed IRawTreeService prelude).
+        services.AddScoped<RawTagCsvExportReader>();
         services.AddSingleton<IDriverBrowser, OpcUaClientDriverBrowser>();
         services.AddSingleton<IDriverBrowser, GalaxyDriverBrowser>();
         // Universal Discover-backed fallback browser (Wave 0). IDriverFactory is bound by the