feat(envelope): push required_res_ver from ResourceConfig on game_start

A wiped/fresh client (NukeIdentityOnStartup, new install, or any path
that clears PlayerPrefs) defaults its stored RES_VER to "00000000"
per Cute/SavedataManager.GetResourceVersion. The client builds the
Akamai manifest URL as dl/Manifest/<RES_VER>/<lang>/<Platform>/, and
Akamai 404s the "00000000" path -> Toolbox.AssetManager.InitializeManifest
fails -> the title screen shows "Connection Error / Reconnect"
before any tutorial UI loads.

Fix:

- New ResourceConfig [ConfigSection] in SVSim.Database — single
  field RequiredResVer defaulting to "4670rPsPMVlRTd2" (the value
  prod returned in data_dumps/traffic_prod_tutorial.ndjson and was
  still returning at 2026-05-28 21:00 UTC). Lives in GameConfigs so
  it can be tuned via DB / appsettings without code edits.

- ShadowverseTranslationMiddleware injects IGameConfigService and
  emits required_res_ver in data_headers ONLY on /check/game_start
  responses. NetworkTask.Parse opens a "new data is available" popup
  whenever required_res_ver is present and the URL is anything other
  than GameStartCheck (NetworkTask.cs:128-138); the suppression on
  game_start is what lets us silently bump PlayerPrefs["RES_VER"]
  before ResourceDownloader runs.

- DataHeaders gains a nullable RequiredResVer field. DataWrapper.DataHeaders
  is now Dictionary<string, object?> instead of the typed DataHeaders POCO
  directly — the construction site stays type-safe (the middleware builds
  the typed POCO, then projects through the same STJ +
  ConvertJsonTreeToPlainObject pipeline that DataWrapper.Data uses) so
  null-valued optional fields are absent from the wire instead of being
  written as "key":null. Without this, MessagePack's ContractlessStandardResolver
  walked the typed properties and wrote required_res_ver=null on every
  non-game_start response, tripping the popup on every boot.

- GameConfigurationJsonbTests updated to expect the 9th config section.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.UnitTests/Models/GameConfigurationJsonbTests.cs

@@ -25,14 +25,19 @@ public class GameConfigurationJsonbTests
         var rows = await db.GameConfigs.AsNoTracking().ToListAsync();
         var byName = rows.ToDictionary(r => r.SectionName);
 
-        // One row per [ConfigSection]-marked POCO (8 sections today: Player, DefaultGrants,
-        // DefaultLoadout, Challenge, Rotation, PackRates, MyRotationSchedule, Story).
+        // One row per [ConfigSection]-marked POCO (9 sections today: Player, DefaultGrants,
+        // DefaultLoadout, Challenge, Rotation, PackRates, MyRotationSchedule, Story, ResourceConfig).
         Assert.That(byName.Keys, Is.EquivalentTo(new[]
         {
             "Player", "DefaultGrants", "DefaultLoadout", "Challenge", "Rotation", "PackRates",
-            "MyRotationSchedule", "Story",
+            "MyRotationSchedule", "Story", "ResourceConfig",
         }));
 
+        var resources = JsonSerializer.Deserialize<ResourceConfig>(byName["ResourceConfig"].ValueJson)!;
+        Assert.That(resources.RequiredResVer, Is.EqualTo("4670rPsPMVlRTd2"),
+            "ShippedDefaults RES_VER is the prod-captured (2026-05-28) Akamai manifest path " +
+            "— required by the client to load the asset manifest after a wiped/fresh install.");
+
         var mrSchedule = JsonSerializer.Deserialize<MyRotationScheduleConfig>(byName["MyRotationSchedule"].ValueJson)!;
         Assert.That(mrSchedule.FreeBattle.Begin, Is.EqualTo(new DateTime(2024, 5, 1, 20, 0, 0, DateTimeKind.Utc)),
             "ShippedDefaults reproduces the 2026-05-23 prod capture so a fresh install ships with Custom Rotation enabled");