feat(hs): web-applicable update plugin for the Heykel Savasi event

AddHeykelSavasiEventUpdateSeason6 (version 100): adds map 92 + terrain,
statue/guard monsters, red/blue base gates, event NPC 560 in Lorencia, and
the mini-game definition to an EXISTING config via the admin Updates page
(no DB wipe). Reuses HeykelSavasiMap/HeykelSavasiInitializer; idempotent.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/Persistence/Initialization/Updates/UpdateVersion.cs

@@ -504,4 +504,9 @@ public enum UpdateVersion
     /// The version of the <see cref="AddWarriorWingsUpdateSeason6"/> (Warrior Wings/Cape 12/242-247).
     /// </summary>
     AddWarriorWingsSeason6 = 99,
+
+    /// <summary>
+    /// The version of the <see cref="AddHeykelSavasiEventUpdateSeason6"/> (Heykel Savasi team event: map 92, NPC 560, mini game definition).
+    /// </summary>
+    AddHeykelSavasiEventSeason6 = 100,
 }