Rewrite to use ffmpeg's tile and loop filters instead of Pillow stitching.
This eliminates the need to load entire panorama into memory.
Changes:
- Remove Pillow dependency
- Use ffmpeg's tile filter to create horizontal panorama
- Use loop filter to repeat the tiled frame
- Apply scrolling crop filter for animation
- No intermediate stitched image file created
- Memory usage stays constant regardless of image count
Benefits for large datasets (e.g., 1379 frames):
- Old approach: ~2.6GB in RAM (2.6M x 1005 pixels)
- New approach: Constant low memory (streams through ffmpeg)
Tested with 5 frames: creates 10s video, 304 frames, 2.61MB
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