feat(deck-builder): /deck_code mint + /deck resolve with 3-min in-memory TTL

Adds the portal pair (shadowverse-portal.com deck-builder endpoints) as
anonymous routes on the app server. The translation middleware learns a new
[NoWireEncryption] attribute that skips both AES calls but keeps the rest of
the msgpack + base64 + envelope pipeline intact, matching prod's portal wire
profile observed in data_dumps/traffic_prod_deckcode.ndjson.

Storage is a 3-minute IMemoryCache — codes are anonymous-global, 4-char
lowercase alphanumeric (matches the shortest prod sample). Foil bit is
stripped on mint to match prod's normalize-on-encode behaviour.

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

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/DeckBuilder/GetDeckFromCodeRequest.cs

@@ -0,0 +1,16 @@
+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.DeckBuilder;
+
+/// <summary>
+/// Portal resolve-by-code request. Anonymous on the wire — does not extend
+/// <see cref="BaseRequest"/>; see <see cref="GenerateDeckCodeRequest"/> for the rationale.
+/// </summary>
+[MessagePackObject]
+public class GetDeckFromCodeRequest
+{
+    [JsonPropertyName("deck_code")]
+    [Key("deck_code")]
+    public string DeckCode { get; set; } = "";
+}