refactor enrichment to tmdb-only and fix review findings

tests/test_config.py

@@ -20,6 +20,7 @@ class TestConfig:
         assert config.series_template == "series/{title}/Season {season:02d}/"
         assert config.log_level == "INFO"
         assert config.quarantine_dir == ".quarantine"
+        assert config.enrichment_providers == ["tmdb"]
     
     def test_config_creation_with_custom_values(self):
         """Test creating Config with custom values."""
@@ -443,6 +444,15 @@ class TestValidateConfig:
         errors = validate_config(config)
         assert any("cannot be empty" in e for e in errors)
 
+    def test_validate_rejects_unsupported_enrichment_provider(self):
+        """Test validating config with unsupported enrichment provider."""
+        config = Config(
+            library_root=Path("/test"),
+            enrichment_providers=["tmdb", "douban"],
+        )
+        errors = validate_config(config)
+        assert any("unsupported providers" in e for e in errors)
+
     def test_validate_category_list_with_non_string(self):
         """Test validating config with non-string in category list."""
         config = Config(