fix: Update moviepy import for v2.x compatibility (closes #6)

moviepy 2.x removed the moviepy.editor submodule. Import AudioFileClip directly from moviepy with a fallback for moviepy 1.x users. Also close the audio clip after writing to prevent resource leaks.

Co-authored-by: Cursor <cursoragent@cursor.com>

utils/audio_processing.py

@@ -1,12 +1,19 @@
-from moviepy.editor import AudioFileClip
 from pathlib import Path
 
+# moviepy 2.x removed moviepy.editor; import directly from moviepy
+try:
+    from moviepy import AudioFileClip
+except ImportError:
+    # Fallback for moviepy 1.x
+    from moviepy.editor import AudioFileClip
+
 def extract_audio(video_path: Path):
     """Extract audio from a video file."""
     try:
         audio = AudioFileClip(str(video_path))
         audio_path = video_path.parent / f"{video_path.stem}_audio.wav"
         audio.write_audiofile(str(audio_path), verbose=False, logger=None)
+        audio.close()
         return audio_path
     except Exception as e:
         raise RuntimeError(f"Audio extraction failed: {e}")