feat(guild): add Guild aggregate schema + migration

SVSim.Database/Entities/Guild/Guild.cs

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+using SVSim.Database.Models;
+
+namespace SVSim.Database.Entities.Guild;
+
+public class Guild
+{
+    public int GuildId { get; set; }                    // server-generated 9-digit
+    public string Name { get; set; } = "";
+    public string Description { get; set; } = "";
+    public long LeaderViewerId { get; set; }
+    public long EmblemId { get; set; }
+    public GuildActivity Activity { get; set; }
+    public GuildJoinCondition JoinCondition { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? BreakupAt { get; set; }            // soft-delete on breakup
+    public List<GuildMember> Members { get; set; } = new();
+}

SVSim.Database/Entities/Guild/GuildChatMessage.cs

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+namespace SVSim.Database.Entities.Guild;
+
+public class GuildChatMessage
+{
+    public long Id { get; set; }                    // global PK
+    public int GuildId { get; set; }
+    public int MessageId { get; set; }              // per-guild monotonic, unique with GuildId
+    public long AuthorViewerId { get; set; }
+    public GuildChatMessageType MessageType { get; set; }
+    public string Body { get; set; } = "";
+    public string? DeckPayload { get; set; }        // jsonb
+    public string? ReplayPayload { get; set; }      // jsonb
+    public string? RoomPayload { get; set; }        // jsonb
+    public DateTime CreatedAt { get; set; }
+    public Guild Guild { get; set; } = null!;
+}

SVSim.Database/Entities/Guild/GuildEnums.cs

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+namespace SVSim.Database.Entities.Guild;
+
+public enum GuildRole : int
+{
+    Regular = 0,
+    Leader = 1,
+    SubLeader = 2,
+}
+
+public enum GuildJoinCondition : int
+{
+    Free = 1,
+    Approval = 2,
+    OnlyInvite = 3,
+}
+
+// Matches GuildDetailInfo.ActivityType (1..16). All / Beginner / Enjoy / Stoic / FriendOnly /
+// per-class (Elf..Nemesis) / Rotation / Unlimited / TwoPick.
+public enum GuildActivity : int
+{
+    All = 1, Beginner = 2, Enjoy = 3, Stoic = 4, FriendOnly = 5,
+    Elf = 6, Royal = 7, Witch = 8, Dragon = 9, Necro = 10,
+    Vampire = 11, Bishop = 12, Nemesis = 13,
+    Rotation = 14, Unlimited = 15, TwoPick = 16,
+}
+
+public enum GuildInviteStatus : int { Pending = 0, Canceled = 1, Rejected = 2, Consumed = 3 }
+public enum GuildJoinRequestStatus : int { Pending = 0, Canceled = 1, Rejected = 2, Accepted = 3 }
+
+// Per docs/api-spec/.../guild_chat-messages.md. 12..18 are gathering-only — never emit on guild.
+public enum GuildChatMessageType : int
+{
+    Normal = 0, Stamp = 1, Deck = 2, Join = 3, Leave = 4, Replay = 5,
+    ChangeLeader = 6, ChangeSubLeader = 7, CreateGuild = 8, Remove = 9,
+    RoomMatch = 10, Description = 11,
+}

SVSim.Database/Entities/Guild/GuildInvite.cs

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+namespace SVSim.Database.Entities.Guild;
+
+public class GuildInvite
+{
+    public int GuildId { get; set; }
+    public long InviteeViewerId { get; set; }
+    public long InviterViewerId { get; set; }
+    public GuildInviteStatus Status { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? RespondedAt { get; set; }
+    public Guild Guild { get; set; } = null!;
+}

SVSim.Database/Entities/Guild/GuildJoinRequest.cs

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+namespace SVSim.Database.Entities.Guild;
+
+public class GuildJoinRequest
+{
+    public int GuildId { get; set; }
+    public long ViewerId { get; set; }
+    public GuildJoinRequestStatus Status { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? RespondedAt { get; set; }
+    public Guild Guild { get; set; } = null!;
+}

SVSim.Database/Entities/Guild/GuildMember.cs

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+namespace SVSim.Database.Entities.Guild;
+
+public class GuildMember
+{
+    public int GuildId { get; set; }
+    public long ViewerId { get; set; }
+    public GuildRole Role { get; set; }
+    public DateTime JoinedAt { get; set; }
+    public Guild Guild { get; set; } = null!;
+}