Add missing VisionConfig class

src/cad_documenter/config.py

@@ -22,6 +22,17 @@ class FrameExtractionConfig:
     blur_threshold: float = 100.0  # Laplacian variance threshold
 
 
+@dataclass
+class VisionConfig:
+    """Vision API configuration."""
+    provider: Literal["openai", "anthropic"] = "openai"
+    openai_api_key: str | None = None
+    anthropic_api_key: str | None = None
+    model: str = "gpt-4o"
+    max_tokens: int = 4096
+    temperature: float = 0.3
+
+
 @dataclass
 class TranscriptionConfig:
     """Transcription configuration."""