feat(Core): implement world availability option (#8755)

src/server/game/World/IWorld.h

@@ -170,6 +170,7 @@ enum WorldBoolConfigs
     CONFIG_REGEN_HP_CANNOT_REACH_TARGET_IN_RAID,
     CONFIG_SET_BOP_ITEM_TRADEABLE,
     CONFIG_ALLOW_LOGGING_IP_ADDRESSES_IN_DATABASE,
+    CONFIG_REALM_LOGIN_ENABLED,
     BOOL_CONFIG_VALUE_COUNT
 };
 

src/server/game/World/World.cpp

@@ -1436,6 +1436,9 @@ void World::LoadConfigSettings(bool reload)
         LOG_ERROR("server.loading", "LFG.KickPreventionTimer can't be higher than 15 minutes.");
     }
 
+    // Realm Availability
+    m_bool_configs[CONFIG_REALM_LOGIN_ENABLED] = sConfigMgr->GetOption<bool>("World.RealmAvailability", false);
+
     // call ScriptMgr if we're reloading the configuration
     sScriptMgr->OnAfterConfigLoad(reload);
 }