feat: web dashboard and playground work

The NexusDashboard-parity dashboard (dDashboardServer) and everything built on it on the experimental branch:
accounts, characters, properties and moderation tools, permissions shared with in-game slash commands, economy
reports, World 3D and property 3D views with client scenery, scheduled events (features, vanity changes, live
events, announcements, restarts), vanity files and events, the CDClient browser, the message inspector with saved
captures, chat filter tools, community challenges, live ops, the AI moderator helper, and the server-side changes
they need.

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

dDatabase/GameDatabase/Database.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <memory>
 #include <string>
 
 #include "GameDatabase.h"
@@ -9,6 +10,10 @@ namespace Database {
 	GameDatabase* Get();
 	void Destroy(std::string source = "");
 
+	// A second, independent connection of the configured type, for work on another thread. Create it on the main
+	// thread (connecting reads the config), then use it from one thread only.
+	std::unique_ptr<GameDatabase> CreateConnection();
+
 	// Used for assigning a test database as the handler for database logic.
 	// Do not use in production code.
 	void _setDatabase(GameDatabase* const db);