refactor(opcuaserver): rename Phase7* address-space pipeline to AddressSpace*

The OPC UA address-space build pipeline was named after a v2-roadmap
milestone number rather than its domain. Rename the family to describe
what it does (build/diff/apply the OPC UA address space):

  Phase7Composer          -> AddressSpaceComposer
  Phase7CompositionResult -> AddressSpaceComposition
  Phase7Planner           -> AddressSpacePlanner
  Phase7Plan              -> AddressSpacePlan
  Phase7Applier           -> AddressSpaceApplier
  Phase7ApplyOutcome      -> AddressSpaceApplyOutcome

The 9 Phase7*Tests suites follow suit; Phase7ScriptingEntitiesTests ->
ScriptingEntitiesTests (it tests the scripting migration, not the
pipeline). Log-message prefixes move to the new class names.

Pure mechanical rename, no behavioral change. EF migration classes/IDs
(AddPhase7ScriptingTables, ExtendComputeGenerationDiffWithPhase7) are
immutable and left untouched, as are historical design docs.

Build clean; OpcUaServer 261/261, Runtime 272/272, ScriptingEntities
12/12 green.

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/OtOpcUaNodeManager.cs

@@ -25,7 +25,7 @@ namespace ZB.MOM.WW.OtOpcUa.OpcUaServer;
 ///
 ///     Node-id encoding uses the manager's default namespace + the caller-supplied string id
 ///     as the identifier portion (e.g. <c>"ns=2;s=eq-1/temp"</c>). Equipment-folder hierarchy
-///     and OPC UA type metadata still come from the Phase7Applier / EquipmentNodeWalker
+///     and OPC UA type metadata still come from the AddressSpaceApplier / EquipmentNodeWalker
 ///     integration (F14b, tracked under #85) — this manager treats every id as a flat
 ///     <see cref="BaseDataVariableState"/> under the namespace root.
 /// </summary>
@@ -1252,7 +1252,7 @@ public sealed class OtOpcUaNodeManager : CustomNodeManager2
     /// <summary>
     ///     Ensure a folder node exists at <paramref name="folderNodeId"/> with the given display
     ///     name, parented under <paramref name="parentNodeId"/> (or the namespace root when null).
-    ///     #85 — used by <see cref="Phase7Applier"/> to materialise the UNS Area/Line/Equipment
+    ///     #85 — used by <see cref="AddressSpaceApplier"/> to materialise the UNS Area/Line/Equipment
     ///     folder hierarchy. Idempotent: the second call with the same id returns the cached
     ///     folder so adding child variables under it still works.
     /// </summary>
@@ -1424,7 +1424,7 @@ public sealed class OtOpcUaNodeManager : CustomNodeManager2
         _ => DataTypeIds.BaseDataType,
     };
 
-    /// <summary>Clear every registered variable + folder from the address space. Phase7Applier
+    /// <summary>Clear every registered variable + folder from the address space. AddressSpaceApplier
     /// calls this when Equipment/Alarm topology changes; the populator then re-adds via
     /// EnsureFolder + WriteValue on the next pass.</summary>
     public void RebuildAddressSpace()