feat(dashboard): chat flags queue

Staff flag chat for review (chat_flag): one message or several from one
conversation, with who it is about and a note. The flag keeps a copy of the
messages and 10 before and after. The Chat Flags page (Inbox, badge for open
flags) filters by status, character and account; a flag links to the character,
the account (mute, warn, ban), their player reports, their other flags and the
conversation, and shows its history. Reviewers (chat_flag_review) mark it
actioned or dismissed, change the note, link a player report or comment; all of
it is in the flag's history and the audit log. The sidebar adds Team Chat.

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

dDashboardServer/DashboardServer.cpp

@@ -55,6 +55,7 @@
 #include "Permissions.h"
 #include "VanityRoutes.h"
 #include "ChatRoutes.h"
+#include "ChatFlagRoutes.h"
 #include "Strikes.h"
 #include "ModerationTools.h"
 #include "ModeratorHelper.h"
@@ -547,6 +548,7 @@ int main(int argc, char** argv) {
 	Game::web.SetWSApiAccessCallback([](const WSAuth& auth) { return Permissions::Allowed(auth.level, "api_access", nullptr, auth.grants.get()); });
 	RegisterVanityRoutes();
 	RegisterChatRoutes();
+	ChatFlagRoutes::RegisterRoutes();
 	RegisterStrikeRoutes();
 	RegisterModerationToolRoutes();
 	ModeratorHelper::RegisterRoutes();