fix: use explicit import for cleanup-logs to avoid tree-shaking

Nuxt's bundler tree-shakes side-effect-only imports (import "./file").
Changed to export the handler from cleanup-logs.ts and call registerTask
explicitly in the plugin to ensure the task is registered at startup.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

server/plugins/03.scheduler.ts

@@ -1,5 +1,6 @@
 import { start, stop } from "../scheduler/engine";
-import "../scheduler/tasks/cleanup-logs";
+import { registerTask } from "../scheduler/registry";
+import cleanupLogs from "../scheduler/tasks/cleanup-logs";
 
 const MAX_CONCURRENCY = Number(process.env.SCHEDULER_MAX_CONCURRENCY) || 5;
 const LOG_RETENTION_DAYS = Number(process.env.SCHEDULER_LOG_RETENTION_DAYS) || 30;
@@ -8,6 +9,8 @@ if (import.meta.dev) {
   console.log("plugin: 03.scheduler");
 }
 
+registerTask("cleanup-logs", cleanupLogs);
+
 export default defineNitroPlugin(async (nitroApp) => {
   await start(MAX_CONCURRENCY, LOG_RETENTION_DAYS);
 

server/scheduler/tasks/cleanup-logs.ts

@@ -1,10 +1,9 @@
-import { registerTask } from "../registry";
 import log4js from "logger";
 
 const logger = log4js.getLogger("SCHEDULER");
 
-registerTask("cleanup-logs", async (payload) => {
+export default async function cleanupLogs(payload?: Record<string, unknown>) {
   const days = (payload?.days as number) ?? 30;
   logger.info("Log cleanup placeholder: would remove logs older than %d days", days);
   return { success: true, message: `Cleaned logs older than ${days} days` };
-});
+}