Two bugs fixed in runScrapeTask / runCatalogueTask:
1. FinishScrapeTask was called with the task's own context, which is
already cancelled when the task is stopped. The PATCH to PocketBase
failed silently, leaving all counters at their initial zero values.
Fix: use a fresh context.WithTimeout(Background, 15s) for the write.
2. BooksFound was double-counted: RunBook already sets BooksFound=1 on
success, but the accumulation loop added an extra +1 unconditionally,
reporting 2 books per successful scrape.
Fix: result.BooksFound += bookResult.BooksFound (drop the + 1).
6776d9106f