Remove pip install from Dockerfile — let HF handle requirements.txt via pyenv pip

Dockerfile

@@ -7,8 +7,6 @@ RUN useradd -m -u 1000 user
 WORKDIR /home/user/app
 
 # Install Python deps — this layer is cached until requirements.txt changes
-COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
 
 # Pre-clone sam-3d-objects and install as a package (no heavy deps)
 RUN git clone --depth=1 https://github.com/facebookresearch/sam-3d-objects.git     /home/user/app/sam-3d-objects     && pip install --no-cache-dir --no-deps -e /home/user/app/sam-3d-objects