chore: remove unused lama-cleaner, add seam-carving to GPU requirements

lama-cleaner is pip-installed but never imported in any Python script.
inpaint.py uses OpenCV TELEA. Removing saves ~100+ MB of image size.
Also added seam-carving to requirements-gpu.txt where it was missing.

packages/ai/python/requirements-gpu.txt

@@ -1,6 +1,5 @@
 rembg==2.0.62
 realesrgan==0.3.0
-lama-cleaner==1.2.5
 paddleocr==2.9.1
 paddlepaddle-gpu==3.0.0
 mediapipe==0.10.21
@@ -8,3 +7,4 @@ onnxruntime-gpu==1.20.1
 numpy==1.26.4
 Pillow==11.1.0
 opencv-python-headless==4.10.0.84
+seam-carving==1.1.0

packages/ai/python/requirements.txt

@@ -1,6 +1,5 @@
 rembg[cpu]==2.0.62
 realesrgan==0.3.0
-lama-cleaner==1.2.5
 paddleocr==2.9.1
 paddlepaddle==3.0.0
 mediapipe==0.10.21