chore: organize solution into module folders (Core/Server/Drivers/Client/Tooling)

Group all 69 projects into category subfolders under src/ and tests/ so the
Rider Solution Explorer mirrors the module structure. Folders: Core, Server,
Drivers (with a nested Driver CLIs subfolder), Client, Tooling.

- Move every project folder on disk with git mv (history preserved as renames).
- Recompute relative paths in 57 .csproj files: cross-category ProjectReferences,
  the lib/ HintPath+None refs in Driver.Historian.Wonderware, and the external
  mxaccessgw refs in Driver.Galaxy and its test project.
- Rebuild ZB.MOM.WW.OtOpcUa.slnx with nested solution folders.
- Re-prefix project paths in functional scripts (e2e, compliance, smoke SQL,
  integration, install).

Build green (0 errors); unit tests pass. Docs left for a separate pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Core/ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms/IAlarmStateStore.cs

@@ -0,0 +1,47 @@
+using System.Collections.Concurrent;
+
+namespace ZB.MOM.WW.OtOpcUa.Core.ScriptedAlarms;
+
+/// <summary>
+///     Persistence for <see cref="AlarmConditionState"/> across server restarts. Phase 7
+///     plan decision #14: operator-supplied state (EnabledState / AckedState /
+///     ConfirmedState / ShelvingState + audit trail) persists; ActiveState is
+///     recomputed from the live predicate on startup so operators never re-ack.
+/// </summary>
+/// <remarks>
+///     Stream E wires this to a SQL-backed store against the <c>ScriptedAlarmState</c>
+///     table with audit logging through <see cref="Core.Abstractions"/> IAuditLogger.
+///     Tests + local dev use <see cref="InMemoryAlarmStateStore"/>.
+/// </remarks>
+public interface IAlarmStateStore
+{
+    Task<AlarmConditionState?> LoadAsync(string alarmId, CancellationToken ct);
+    Task<IReadOnlyList<AlarmConditionState>> LoadAllAsync(CancellationToken ct);
+    Task SaveAsync(AlarmConditionState state, CancellationToken ct);
+    Task RemoveAsync(string alarmId, CancellationToken ct);
+}
+
+/// <summary>In-memory default — used by tests + by dev deployments without a SQL backend.</summary>
+public sealed class InMemoryAlarmStateStore : IAlarmStateStore
+{
+    private readonly ConcurrentDictionary<string, AlarmConditionState> _map
+        = new(StringComparer.Ordinal);
+
+    public Task<AlarmConditionState?> LoadAsync(string alarmId, CancellationToken ct)
+        => Task.FromResult(_map.TryGetValue(alarmId, out var v) ? v : null);
+
+    public Task<IReadOnlyList<AlarmConditionState>> LoadAllAsync(CancellationToken ct)
+        => Task.FromResult<IReadOnlyList<AlarmConditionState>>(_map.Values.ToArray());
+
+    public Task SaveAsync(AlarmConditionState state, CancellationToken ct)
+    {
+        _map[state.AlarmId] = state;
+        return Task.CompletedTask;
+    }
+
+    public Task RemoveAsync(string alarmId, CancellationToken ct)
+    {
+        _map.TryRemove(alarmId, out _);
+        return Task.CompletedTask;
+    }
+}