feat(guild): service skeletons + DI

SVSim.Database/Services/Guild/GuildChatService.cs

@@ -0,0 +1,55 @@
+using SVSim.Database.Repositories.Guild;
+using SVSim.Database.Services;
+
+namespace SVSim.Database.Services.Guild;
+
+public sealed class GuildChatService : IGuildChatService
+{
+    private readonly IGuildRepository _guilds;
+    private readonly IGuildMemberRepository _members;
+    private readonly IGuildInviteRepository _invites;
+    private readonly IGuildJoinRequestRepository _joinRequests;
+    private readonly IGuildChatMessageRepository _chatMessages;
+    private readonly IGameConfigService _config;
+
+    public GuildChatService(
+        IGuildRepository guilds,
+        IGuildMemberRepository members,
+        IGuildInviteRepository invites,
+        IGuildJoinRequestRepository joinRequests,
+        IGuildChatMessageRepository chatMessages,
+        IGameConfigService config)
+    {
+        _guilds = guilds;
+        _members = members;
+        _invites = invites;
+        _joinRequests = joinRequests;
+        _chatMessages = chatMessages;
+        _config = config;
+    }
+
+    public Task<ChatWindow> GetWindowAsync(long viewerId, int startMessageId, int direction, int waitIntervalHint, CancellationToken ct = default)
+        => throw new NotImplementedException();
+
+    public Task<ChatPostResult> PostTextOrStampAsync(long viewerId, int type, string message, CancellationToken ct = default)
+        => throw new NotImplementedException();
+
+    public Task<ChatPostResult> PostDeckAsync(long viewerId, string deckPayloadJson, CancellationToken ct = default)
+        => throw new NotImplementedException();
+
+    public Task<bool> DeleteDeckAsync(long viewerId, int messageId, CancellationToken ct = default)
+        => throw new NotImplementedException();
+
+    public Task<ChatPostResult> PostReplayAsync(long viewerId, string replayPayloadJson, CancellationToken ct = default)
+        => throw new NotImplementedException();
+
+    public Task<string?> GetReplayDetailAsync(long viewerId, int messageId, CancellationToken ct = default)
+        => throw new NotImplementedException();
+
+    public Task<string?> GetDeckLogAsync(long viewerId, int messageId, CancellationToken ct = default)
+        => throw new NotImplementedException();
+
+    // No-op skeleton — will be wired in Phase 5.
+    public Task EmitSystemEventAsync(int guildId, long actorViewerId, Entities.Guild.GuildChatMessageType type, string? body = null, CancellationToken ct = default)
+        => Task.CompletedTask;
+}