add incremental enrich controls with progress and retry limits

src/vlm/providers/__init__.py

@@ -0,0 +1,12 @@
+"""Provider implementations for enrichment."""
+
+from vlm.providers.base import EnrichmentProvider, ProviderResult
+from vlm.providers.tmdb import TMDBProvider
+from vlm.providers.douban import DoubanProvider
+
+__all__ = [
+    "EnrichmentProvider",
+    "ProviderResult",
+    "TMDBProvider",
+    "DoubanProvider",
+]