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/Server/ZB.MOM.WW.OtOpcUa.Server/Alarms/AlarmConditionTransition.cs

@@ -0,0 +1,44 @@
+namespace ZB.MOM.WW.OtOpcUa.Server.Alarms;
+
+/// <summary>
+///     Lifecycle transition for an alarm condition. Mirrors OPC UA Part 9 alarm states
+///     simplified to the active / acknowledged / inactive triplet that every driver in
+///     the repo exposes today.
+/// </summary>
+public enum AlarmStateTransition
+{
+    /// <summary>InAlarm flipped false → true. Default to unacknowledged.</summary>
+    Active,
+
+    /// <summary>Acked flipped false → true while the alarm is still active.</summary>
+    Acknowledged,
+
+    /// <summary>InAlarm flipped true → false.</summary>
+    Inactive,
+}
+
+/// <summary>
+///     One alarm-state transition raised by <see cref="AlarmConditionService.TransitionRaised"/>.
+/// </summary>
+/// <param name="ConditionId">Stable identifier the caller registered the condition under (typically the driver's alarm full reference).</param>
+/// <param name="Transition">Which state the alarm transitioned to.</param>
+/// <param name="Priority">Latest known priority. 0 when no priority sub-attribute was registered or no value has been observed yet.</param>
+/// <param name="Description">Latest known description text; null when not registered or not yet observed.</param>
+/// <param name="AtUtc">Server-clock UTC of the value change that produced this transition.</param>
+public sealed record AlarmConditionTransition(
+    string ConditionId,
+    AlarmStateTransition Transition,
+    int Priority,
+    string? Description,
+    DateTime AtUtc);
+
+/// <summary>
+///     Read-only snapshot of an alarm condition's current state. Used for diagnostics
+///     and dashboards; not part of the live transition stream.
+/// </summary>
+public sealed record AlarmConditionSnapshot(
+    string ConditionId,
+    bool InAlarm,
+    bool Acked,
+    int Priority,
+    string? Description);