fix: Fixes dirty-tracking gaps in generated content: setters, sub-object owners, BaseVendor (#2609)

## Why

Delta world saves re-serialize an entity only when it has been marked dirty. An audit of the generated classes found three ways serialized state changes without a mark; this PR closes the ones that do not need a new generator package.

## What

- **Custom `[SerializableProperty]` setters mark dirty.** Twelve hand-written setters assigned their backing field without `this.MarkDirty()`. `PlagueBeastLord.OpenedBy` was an auto-property carrying the attribute with no backing field at all; it is now a generated field with the same name, order and command-property exposure.
- **Generated sub-objects are linked to their owner.** Without a `[DirtyTrackingEntity]` member the generator emits setters that mark nothing. Eight entity-owned sub-objects now carry the link and receive the owner through the constructor the generator calls: `BOBFilter` (owner is `IEntity`: a `PlayerMobile` or a `BulkOrderBook`), `BOBLargeSubEntry`, `PuzzleChestSolution` and `PuzzleChestSolutionAndTime`, `TalismanAttribute` (the random factories now take the talisman), `VendorItem`, `PlayerBBMessage`, `RaffleEntry`, `ShardPollOption`. Migration schemas were regenerated with the pinned tool; the only change is the value rule argument becoming `DeserializationRequiresParent`.
- **BaseVendor uses the generator; restock amounts are no longer persisted.** The only state it wrote was which buy entries had grown restock amounts, packed by index into the live `SBInfos` tables. Restock is transient now and rebuilds on load; version 1 records are read and discarded through the legacy path. Every vendor subclass now serializes through a generated chain.

## Generator 4.1.0

This PR adopts SerializationGenerator 4.1.0 (modernuo/SerializationGenerator#55): SG3019/SG3020 diagnostics, `[VolatileSerializedState]`, `StopXxx()` timer helpers, and owner-constructor preference for sub-objects (so dictionary values are constructed with their owner; the 4.0.0 relink fallback is gone). `PlayerVendor.v3.json` gains `DeserializationRequiresParent` for its `VendorItem` values so the migration content struct constructs them with their vendor.

SG3019 is an error under `TreatWarningsAsErrors` and generator diagnostics ignore pragmas, so the five contexts that live in whole-file player-keyed persistences (`ChampionTitle`, `ChampionTitleContext`, `MurderContext`, `VirtueContext`, `JailRecord`) now carry a `[DirtyTrackingEntity]` link to their `PlayerMobile`, which is where they will live once those blobs move onto the player record. `JailSystem.EmptyRecord` keeps a null player (`[CanBeNull]`). `ChampionTitle` needs both a context and a player constructor because the generator resolves the rule against the containing type but emits the call with the parent field; a comment in the file records this.

## Wire format

Unchanged. No version bumps except `BaseVendor` 1 to 2 (which now writes nothing of its own). Schema diffs are rule-argument only (`DeserializationRequiresParent`).

## Testing

Server.Tests 848 passed, UOContent.Tests 759 passed.

Projects/UOContent/Items/Special/House Raffle/HouseRaffleStone.cs

@@ -16,6 +16,9 @@ namespace Server.Items;
 [SerializationGenerator(0)]
 public partial class RaffleEntry
 {
+    [DirtyTrackingEntity]
+    private HouseRaffleStone _stone;
+
     [SerializableField(0, setter: "private")]
     private Mobile _from;
 
@@ -25,15 +28,17 @@ public partial class RaffleEntry
     [SerializableField(2, setter: "private")]
     private DateTime _date;
 
-    public RaffleEntry(Mobile from)
+    public RaffleEntry(HouseRaffleStone stone, Mobile from)
     {
+        _stone = stone;
         _from = from;
         _address = from?.NetState?.Address ?? IPAddress.None;
         _date = Core.Now;
     }
 
-    public RaffleEntry()
+    public RaffleEntry(HouseRaffleStone stone)
     {
+        _stone = stone;
         _from = null;
         _address = null;
         _date = Core.Now;
@@ -454,7 +459,7 @@ public partial class HouseRaffleStone : Item
             if (_ticketPrice == 0 || from.Backpack?.ConsumeTotal(typeof(Gold), _ticketPrice) == true ||
                 Banker.Withdraw(from, _ticketPrice))
             {
-                AddToEntries(new RaffleEntry(from));
+                AddToEntries(new RaffleEntry(this, from));
 
                 from.SendMessage(MessageHue, "You have successfully entered the plot's raffle.");
             }
@@ -539,7 +544,7 @@ public partial class HouseRaffleStone : Item
 
         for (var i = 0; i < entryCount; i++)
         {
-            var entry = new RaffleEntry();
+            var entry = new RaffleEntry(this);
             entry.Deserialize(reader);
 
             if (entry.From == null)