feat: add cleanup script and o2switch deployment docs

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/cleanup.js

@@ -0,0 +1,28 @@
+import { loadConfig } from './config.js';
+import { getPool, closePool } from './db.js';
+import { uploadPath, outputPath, deleteIfExists } from './storage.js';
+import { findExpiredJobs, deleteJob } from './jobs/jobRepository.js';
+
+export async function runCleanup(pool, config) {
+  const expiredJobs = await findExpiredJobs(pool);
+
+  for (const job of expiredJobs) {
+    await deleteIfExists(uploadPath(config, job.id, job.sourceFormat));
+    await deleteIfExists(outputPath(config, job.id, job.targetFormat));
+    await deleteJob(pool, job.id);
+  }
+
+  return expiredJobs.length;
+}
+
+async function main() {
+  const config = loadConfig();
+  const pool = getPool(config);
+  const deletedCount = await runCleanup(pool, config);
+  console.log(`Cleanup: removed ${deletedCount} expired job(s).`);
+  await closePool();
+}
+
+if (import.meta.url === `file://${process.argv[1]}`) {
+  main();
+}