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/routes/APIRoutes.cpp

@@ -474,7 +474,8 @@ namespace {
 					{"pendingGuildNames", snapshot.pendingGuildNames},
 					{"pendingProperties", snapshot.pendingProperties},
 					{"unresolvedBugReports", snapshot.unresolvedBugReports},
-					{"openEconomyFlags", snapshot.openEconomyFlags}
+					{"openEconomyFlags", snapshot.openEconomyFlags},
+					{"openChatFlags", snapshot.openChatFlags}
 				});
 			});