feat(uns-v3): implement EffectiveNameGuard authoring-time uniqueness guard (B3-WP2)

Implements IEffectiveNameGuard (the Wave-A contract): per-equipment effective-name
uniqueness across UnsTagReferences (DisplayNameOverride else backing raw tag Name),
VirtualTags (Name), and ScriptedAlarms (Name). Ordinal comparison, self-row exclusion
by (kind, id), one pooled context per CheckAsync call. Registered Scoped in
EndpointRouteBuilderExtensions so WP1's UnsTreeService consumer goes live.

Verified the deploy-time DraftValidator UnsEffectiveNameCollision rule already
computes reference effective names from the backing raw tag's current Name (catches
rename-induced collisions), spans all three sources, compares ordinal, and names both
colliding sources + the equipment — no hardening needed. DraftSnapshotFactory already
loads Tags/UnsTagReferences/VirtualTags/ScriptedAlarms.

Tests: 8 guard tests (in-memory EF) + 3 deploy-gate tests (rename-induced collision,
override-vs-VT, ordinal case-sensitivity). All green.

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

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

@@ -49,6 +49,10 @@ public static class EndpointRouteBuilderExtensions
         services.AddScoped<Browsing.IBrowserSessionService, Browsing.BrowserSessionService>();
         services.AddScoped<IUnsTreeService, UnsTreeService>();
         services.AddScoped<IRawTreeService, RawTreeService>();
+        // v3 Batch 3 (WP2): authoring-time UNS effective-name uniqueness guard. Consumed by
+        // UnsTreeService's reference/VirtualTag/ScriptedAlarm mutations (WP1); mirrors the
+        // deploy-time DraftValidator UnsEffectiveNameCollision rule.
+        services.AddScoped<IEffectiveNameGuard, EffectiveNameGuard>();
         // WP5 CSV export enumeration (read-only; does not extend the closed IRawTreeService prelude).
         services.AddScoped<RawTagCsvExportReader>();
         services.AddSingleton<IDriverBrowser, OpcUaClientDriverBrowser>();