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.EmulatedEntrypoint/Models/Dtos/Internal/DataHeaders.cs

@@ -32,4 +32,23 @@ public class DataHeaders
     [JsonPropertyName("udid")]
     [Key("udid")]
     public string Udid { get; set; } = "";
+
+    /// <summary>
+    /// Tells the client the required version path component for asset manifests on the
+    /// resource server (Akamai CDN, hardcoded to <c>shadowverse.akamaized.net/</c> in
+    /// <c>Wizard/SetUp.cs:48</c>). <c>NetworkTask.setResourceVersion</c> writes the value
+    /// to <c>PlayerPrefs["RES_VER"]</c>; the manifest URL becomes
+    /// <c>dl/Manifest/&lt;RES_VER&gt;/&lt;lang&gt;/&lt;Platform&gt;/</c>. When the client
+    /// has no cached <c>RES_VER</c> (e.g., after <c>NukeIdentityOnStartup</c> wipes
+    /// PlayerPrefs), it defaults to <c>"00000000"</c>, which Akamai doesn't serve — the
+    /// manifest fetch 404s and the client shows "Connection Error / Reconnect" before
+    /// the tutorial UI ever appears.
+    /// <para>
+    /// Nullable to keep it off the wire on responses that don't need it (the global
+    /// <c>WhenWritingNull</c> policy in Program.cs handles the omission).
+    /// </para>
+    /// </summary>
+    [JsonPropertyName("required_res_ver")]
+    [Key("required_res_ver")]
+    public string? RequiredResVer { get; set; }
 }

SVSim.EmulatedEntrypoint/Models/Dtos/Internal/DataWrapper.cs

@@ -10,11 +10,20 @@ namespace SVSim.EmulatedEntrypoint.Models.Dtos.Internal;
 public class DataWrapper
 {
     /// <summary>
-    /// Additional data about the request, response and user.
+    /// Wire-shape projection of the response envelope headers. The middleware builds a
+    /// strongly-typed <see cref="DataHeaders"/> POCO and runs it through the same STJ +
+    /// <c>ConvertJsonTreeToPlainObject</c> pipeline that the controller's response goes
+    /// through, yielding this dict with absent keys for null-valued optional fields.
+    /// Typed as <see cref="Dictionary{TKey,TValue}"/> (not <see cref="object"/>) because
+    /// the projected shape is fully known — only the per-key value type varies. Direct
+    /// assignment of the typed POCO would let MessagePack's contractless resolver emit
+    /// <c>"key":null</c> for nullables, which the client treats as "key present" via
+    /// <c>Keys.Contains</c> (see <c>NetworkTask.isResourceVersionUp</c> for the
+    /// load-bearing case).
     /// </summary>
     [JsonPropertyName("data_headers")]
-    [Key("data_headers")] 
-    public DataHeaders DataHeaders { get; set; } = new DataHeaders();
+    [Key("data_headers")]
+    public Dictionary<string, object?> DataHeaders { get; set; } = new();
 
     /// <summary>
     /// The response data from the endpoint.