feat(chat): the chat server handles guilds

Connects GuildManager to the chat server (ChatGuilds): the client's GUILD_INVITE, GUILD_INVITE_RESPONSE, GUILD_LEAVE
and GUILD_GET_ALL (routed through its world), the worlds' GUILD_CREATE, GUILD_KICK, GUILD_SET_RANK and GUILD_DISBAND,
guild chat (GENERAL_CHAT_MESSAGE in channel 10, sent to the online members as channel 10 private chat, which the
client's guild tab shows, and logged as "guild"), guildmates told when a member logs in, out or changes worlds, and a
member's pending invite dropped when they log off. Client packets go through the member's world as WorldRoutePacket;
GUILD_GET_STATUS goes to the world itself.

Guild names: the chat filter's deny list refuses a name (dChatFilter::HasDenyList, since without a deny list the deny
check refuses everything); a name the allow list doesn't cover waits for moderation, as pet names do.

The dashboard's new player action GUILD_CHANGED goes from master to the chat server only (answered 1 when chat is
connected), which catches online members up. chatconfig.ini: guild_max_members (100) and guild_invite_timeout (600
seconds).

Check in game: nothing yet on its own (the world side makes guilds reachable). Server log: the chat server starts and
logs no unhandled guild packets.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dChatServer/ChatGuilds.h

@@ -0,0 +1,13 @@
+#ifndef CHATGUILDS_H
+#define CHATGUILDS_H
+
+class GuildManager;
+
+// The chat server's GuildManager, connected to its players, database, chat filter and worlds (docs/Guilds.md)
+namespace ChatGuilds {
+	// Reads guild_max_members and guild_invite_timeout; call once after the database, config and chat filter are up
+	void Initialize();
+	GuildManager& Get();
+}
+
+#endif // CHATGUILDS_H