feat(guild): controller scaffolding + /guild/info baseline

- 5 common DTOs under Models/Dtos/Common/Guild/ (GuildDetailDto,
  GuildUserBaseDto, GuildMemberInfoDto, ChatUserDto, ChatMessageDto)
- 28 per-endpoint request/response DTOs under Models/Dtos/Guild/ and
  Models/Dtos/GuildChat/ with full [MessagePackObject]/[Key]/
  [JsonPropertyName] attribute mirrors on every property
- GuildController (22 actions): /guild/info returns prod-shape with
  config-backed max_member_num/max_sub_leader_num/usable_stamp_list;
  21 stubs return empty/default DTOs
- GuildChatController (7 stubs), /guild_chat/messages stub returns
  wait_interval=10 per config
- 29 new routing smoke test cases (100 total, all pass)
- GuildWireShape literal-JSON test for GuildInfoResponse (1/1 pass)
- GameConfigurationJsonbTests updated for 17th GuildConfig section
- Total: 1422 tests pass, 0 errors

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SVSim.EmulatedEntrypoint/Models/Dtos/GuildChat/GuildChatMessagesResponse.cs

@@ -0,0 +1,31 @@
+using MessagePack;
+using System.Text.Json.Serialization;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Common;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Common.Guild;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.GuildChat;
+
+/// <summary>Response for POST /guild_chat/messages.</summary>
+[MessagePackObject]
+public class GuildChatMessagesResponse
+{
+    /// <summary>Card ids currently disabled for maintenance — client refreshes its global list.</summary>
+    [JsonPropertyName("maintenance_card_list"), Key("maintenance_card_list"),
+     JsonIgnore(Condition = JsonIgnoreCondition.Never)]
+    public List<int> MaintenanceCardList { get; set; } = new();
+
+    /// <summary>Users referenced by messages in this batch — deduplicated catalog.</summary>
+    [JsonPropertyName("users"), Key("users"),
+     JsonIgnore(Condition = JsonIgnoreCondition.Never)]
+    public List<ChatUserDto> Users { get; set; } = new();
+
+    /// <summary>Messages ordered oldest-to-newest.</summary>
+    [JsonPropertyName("chat_message"), Key("chat_message"),
+     JsonIgnore(Condition = JsonIgnoreCondition.Never)]
+    public List<ChatMessageDto> ChatMessage { get; set; } = new();
+
+    /// <summary>Server-driven polling interval in seconds. Client uses this for the next poll.</summary>
+    [JsonPropertyName("wait_interval"), Key("wait_interval"), JsonConverter(typeof(StringifiedIntConverter)),
+     JsonIgnore(Condition = JsonIgnoreCondition.Never)]
+    public int WaitInterval { get; set; }
+}