Revert EMULATOR_MODE to rcon default, restore RCON config

src/lib/services/alert.ts

@@ -223,8 +223,10 @@ export function emulatorOffline(detail?: string): Promise<SendAlertResult> {
 		severity: "critical",
 		message: detail
 			? `Emulator appears offline: ${detail}`
-			: "Emulator appears offline — emulator API connection could not be established.",
+			: "Emulator appears offline — RCON connection could not be established.",
 		context: {
+			rconHost: env.RCON_HOST,
+			rconPort: env.RCON_PORT,
 			...(detail ? { detail } : {}),
 		},
 	});