fix: eliminate greenlet crash + memory leak protection

- docker-compose: switch worker to --pool=solo --concurrency=1 --max-tasks-per-child=1
- tasks.py: remove ThreadPoolExecutor wrapper from _run_browser_job (greenlet crash)
- scraper.py: browser fallback runs sequentially instead of ThreadPoolExecutor
- scraper.py: add gc.collect() after scraper close to prevent memory leaks

iaai_scraper/scraper.py

@@ -1,3 +1,4 @@
+import gc
 import json
 import logging
 import os
@@ -201,6 +202,7 @@ class IAAIScraper:
                 pass
             finally:
                 self._http_pool = None
+        gc.collect()
 
     def _new_context(self) -> BrowserContext:
         if self.browser is None:
@@ -1623,23 +1625,17 @@ class IAAIScraper:
                 "protection_events": local_protection,
             }
 
-        # Одна страница — в главном потоке.
-        if n_pages == 1:
-            res = _process_slice(slices[0] if slices else [])
+        # Playwright sync API использует greenlets, привязанные к потоку.
+        # Запуск в ThreadPoolExecutor вызывает greenlet crash.
+        # Обрабатываем все слайсы последовательно в текущем потоке.
+        for s in slices:
+            if not s:
+                continue
+            res = _process_slice(s)
             records.extend(res["records"])
             failures.extend(res["failures"])
             cars_failed += res["cars_failed"]
             protection_events += res["protection_events"]
-        else:
-            # Несколько страниц — параллельно, каждый поток со своей Page.
-            with ThreadPoolExecutor(max_workers=n_pages) as executor:
-                futures = [executor.submit(_process_slice, s) for s in slices if s]
-                for fut in as_completed(futures):
-                    res = fut.result()
-                    records.extend(res["records"])
-                    failures.extend(res["failures"])
-                    cars_failed += res["cars_failed"]
-                    protection_events += res["protection_events"]
 
         return {
             "records": records,