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/CharacterTools.cpp

@@ -130,6 +130,7 @@ namespace {
 		q.characterId = characterId;
 		q.accountId = accountId;
 		q.includePrivate = Can(context, "chat_private");
+		q.includeWhispers = Can(context, "chat_dms");
 		q.newestFirst = true;
 		q.limit = 100;
 		nlohmann::json rows = nlohmann::json::array();