Add S3-backed storage to prevent data loss

- New lib/storage.mjs: async S3 backup on every queue/log save
- Versioned S3 bucket (claw-apply-data) keeps every revision
- Auto-restore from S3 if local file is missing or corrupt
- saveQueue/saveLog now validate data type before writing
  (prevents the exact bug that corrupted the queue)
- IAM role attached to EC2 instance for credential-free S3 access
- Config: storage.type = "local" (default) or "s3"

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

job_filter.mjs

@@ -30,7 +30,7 @@ const origStderrWrite = process.stderr.write.bind(process.stderr);
 process.stdout.write = (chunk, ...args) => { logStream.write(chunk); return origStdoutWrite(chunk, ...args); };
 process.stderr.write = (chunk, ...args) => { logStream.write(chunk); return origStderrWrite(chunk, ...args); };
 
-import { getJobsByStatus, updateJobStatus, loadConfig, loadQueue, saveQueue, dedupeAfterFilter } from './lib/queue.mjs';
+import { getJobsByStatus, updateJobStatus, loadConfig, loadQueue, saveQueue, dedupeAfterFilter, initQueueFromS3 } from './lib/queue.mjs';
 import { loadProfile, submitBatches, checkBatch, downloadResults } from './lib/filter.mjs';
 import { sendTelegram, formatFilterSummary } from './lib/notify.mjs';
 import { DEFAULT_FILTER_MODEL, DEFAULT_FILTER_MIN_SCORE } from './lib/constants.mjs';
@@ -305,6 +305,7 @@ async function main() {
   }
 
   const settings = loadConfig(resolve(__dir, 'config/settings.json'));
+  await initQueueFromS3(settings);
   const searchConfig = loadConfig(resolve(__dir, 'config/search_config.json'));
   const candidateProfile = loadConfig(resolve(__dir, 'config/profile.json'));