fix(scripts): backfill arg parser consumed --workers value as LIMIT

'--workers 3' set limit=3 because the bare '3' also hit the isdigit() branch.
Skip flag-value positions when scanning for a positional LIMIT.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

scripts/backfill_xvideos_performers.py

@@ -44,13 +44,20 @@ def _args() -> tuple[int, bool, int, float]:
     commit = "--commit" in sys.argv
     workers = 3
     sleep = 0.3
-    for i, a in enumerate(sys.argv[1:], 1):
-        if a.isdigit():
+    argv = sys.argv[1:]
+    skip = False
+    for i, a in enumerate(argv):
+        if skip:  # ta pozycja to wartość poprzedniej flagi (--workers/--sleep) — nie traktuj jako LIMIT
+            skip = False
+            continue
+        if a == "--workers" and i + 1 < len(argv):
+            workers = int(argv[i + 1]); skip = True
+        elif a == "--sleep" and i + 1 < len(argv):
+            sleep = float(argv[i + 1]); skip = True
+        elif a == "--commit":
+            continue
+        elif a.isdigit():
             limit = int(a)
-        elif a == "--workers" and i < len(sys.argv) - 1:
-            workers = int(sys.argv[i + 1])
-        elif a == "--sleep" and i < len(sys.argv) - 1:
-            sleep = float(sys.argv[i + 1])
     return limit, commit, workers, sleep