feat(dashboard): reading whispers is its own permission

chat_dms (GM 8) reads whispers; chat_private is now team and guild chat only.
Adds chat_flag and chat_flag_review (GM 3). Both can be granted per account or
character with the permission grants.

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

dDashboardServer/routes/PrometheusMetrics.cpp

@@ -157,6 +157,7 @@ namespace {
 		}
 		IChatLog::ChatQuery q;
 		q.includePrivate = true;
+		q.includeWhispers = true;
 		q.limit = CHAT_PAGE;
 		for (uint32_t page = 0; page < CHAT_PAGES && g_ChatSeen < newest; page++) {
 			q.afterId = g_ChatSeen;