Replace the per-tour import UI with a fire-and-forget background job:
- Add `import_batches` DB table tracking status, found/imported/duplicate counts
- Add `runKomootBulkImport` server function that pages all Komoot tours,
fetches GPX, creates activities, and deduplicates via sync_imports
- Add `komoot-bulk-import` pg-boss job registered at server startup
- Add POST /api/sync/komoot/import to enqueue the job
- Add GET /api/sync/komoot/import-status to return the latest batch
- Replace the Komoot import page with a progress UI that polls every 2s
while a batch is running and shows found/imported/skipped counts
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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