Add missing FrameExtractionConfig class

src/cad_documenter/config.py

@@ -11,6 +11,17 @@ except ImportError:
     import tomli as tomllib
 
 
+@dataclass
+class FrameExtractionConfig:
+    """Frame extraction configuration."""
+    mode: Literal["interval", "scene", "hybrid"] = "hybrid"
+    interval_seconds: float = 2.0
+    scene_threshold: float = 0.3
+    min_frames: int = 5
+    max_frames: int = 15
+    blur_threshold: float = 100.0  # Laplacian variance threshold
+
+
 @dataclass
 class TranscriptionConfig:
     """Transcription configuration."""