feat(guild): add Guild aggregate schema + migration

SVSim.Database/Entities/Guild/GuildEnums.cs

@@ -0,0 +1,36 @@
+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,
+}