refactor(configdb): drop GenerationId FK from live-edit entities

Phase 1b of the v2 entity-model rewrite. The design's live-edit model means
the 12 v2 live-edit entities no longer carry a generation scope — they're
edited directly via AdminOperationsActor, with RowVersion (added in Task 14a)
providing last-write-wins detection.

Entity changes (12 files):

  Equipment, DriverInstance, Device, Tag, PollGroup, Namespace,
  UnsArea, UnsLine, NodeAcl, Script, VirtualTag, ScriptedAlarm

  - Removed: public long GenerationId
  - Removed: public ConfigGeneration? Generation (navigation)

DbContext changes (OtOpcUaConfigDbContext.cs):

  - Removed 12 HasOne(x => x.Generation).WithMany().HasForeignKey... mappings
  - Rewrote ~36 indexes: dropped the GenerationId column from each composite
    key, renamed UX_<Table>_Generation_<X> -> UX_<Table>_<X> and
    IX_<Table>_Generation_<X> -> IX_<Table>_<X>. Logical IDs become globally
    unique (UX_<Table>_LogicalId on the LogicalId column alone).
  - Removed Namespace's redundant UX_Namespace_Generation_LogicalId_Cluster
    index (subsumed by the new UX_Namespace_LogicalId).

Core.Tests fixtures (4 files):

  Removed "GenerationId = 1," lines from:
    - PermissionTrieBuilderTests.cs (NodeAcl Row factory)
    - PermissionTrieTests.cs (NodeAcl Row factory)
    - TriePermissionEvaluatorTests.cs (NodeAcl Row factory + 2 gen{1,5}Row
      mutations that test stale-generation evaluation; the trie itself still
      carries a generation tag via PermissionTrie.GenerationId, fed in via
      PermissionTrieBuilder.Build's generationId parameter, so the tests
      still exercise the production code path)
    - EquipmentNodeWalkerTests.cs (Area/Line/Eq/Tag/VirtualTag/ScriptedAlarm
      builders)

Expected breakage (accepted per Task 56 policy):

  src/Server/ZB.MOM.WW.OtOpcUa.Server   ~25 errors  (DriverInstanceBootstrapper,
                                                     AuthorizationBootstrap,
                                                     EquipmentNamespaceContentLoader,
                                                     Phase7Composer, ...)
  src/Server/ZB.MOM.WW.OtOpcUa.Admin    ~45 errors  (VirtualTags.razor,
                                                     ScriptedAlarms.razor,
                                                     DriverInstanceService,
                                                     EquipmentService,
                                                     EquipmentImportBatchService,
                                                     UnsService,
                                                     FocasDriverDetailService,
                                                     ...)

Server.Tests, Admin.Tests, Admin.E2ETests also break transitively (they
project-reference Server/Admin). All deleted in Task 56.

Verification:
  dotnet build src/Core/ZB.MOM.WW.OtOpcUa.Configuration -> 0 errors
  dotnet build tests/Core/ZB.MOM.WW.OtOpcUa.Core.Tests  -> 0 errors
  dotnet build tests/Core/ZB.MOM.WW.OtOpcUa.Configuration.Tests -> 0 errors
  dotnet build (whole solution) -> 70 errors, all in Server/Admin

src/Core/ZB.MOM.WW.OtOpcUa.Configuration/Entities/Device.cs

@@ -5,8 +5,6 @@ public sealed class Device
 {
     public Guid DeviceRowId { get; set; }
 
-    public long GenerationId { get; set; }
-
     public required string DeviceId { get; set; }
 
     /// <summary>Logical FK to <see cref="DriverInstance.DriverInstanceId"/>.</summary>
@@ -21,6 +19,4 @@ public sealed class Device
 
     /// <summary>Optimistic concurrency token for last-write-wins detection in the v2 live-edit model.</summary>
     public byte[] RowVersion { get; set; } = Array.Empty<byte>();
-
-    public ConfigGeneration? Generation { get; set; }
 }