fix: use python:3.10-slim base image for better HF Spaces compatibility

Dockerfile

@@ -1,12 +1,10 @@
 # Read the doc: https://huggingface.co/docs/hub/spaces-sdks-docker
-# GPU-optimized Dockerfile for Face Swap Video API
+# Dockerfile for Face Swap Video API
 
-FROM nvidia/cuda:12.1.0-cudnn8-runtime-ubuntu22.04
+FROM python:3.10-slim
 
 # Install system dependencies
 RUN apt-get update && apt-get install -y \
-    python3.10 \
-    python3-pip \
     ffmpeg \
     libgl1-mesa-glx \
     libglib2.0-0 \
@@ -15,54 +13,30 @@ RUN apt-get update && apt-get install -y \
 
 # Create user for Hugging Face Spaces (following HF Spaces best practices)
 RUN useradd -m -u 1000 user
+USER user
+ENV PATH="/home/user/.local/bin:$PATH"
 
 # Set working directory
 WORKDIR /app
 
-# Create upload directories first
-RUN mkdir -p uploads/source_images uploads/target_videos uploads/result_videos uploads/output
-
 # Copy requirements file
-COPY requirements.txt requirements.txt
+COPY --chown=user:user ./requirements.txt requirements.txt
 
-# Install Python dependencies as root first
-RUN pip3 install --no-cache-dir --upgrade pip && \
-    pip3 install --no-cache-dir \
-    fastapi>=0.115.2 \
-    uvicorn[standard]==0.24.0 \
-    python-multipart>=0.0.18 \
-    motor==3.3.2 \
-    pymongo==4.6.0 \
-    python-dotenv==1.0.0 \
-    dnspython==2.4.2 \
-    numpy==1.24.3 \
-    insightface==0.7.3 \
-    onnxruntime-gpu==1.17.3 \
-    opencv-python \
-    psutil==5.9.5 \
-    tqdm==4.65.0 \
-    Pillow \
-    moviepy==1.0.3 \
-    imageio-ffmpeg \
-    huggingface_hub>=0.23.0
+# Install Python dependencies
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir --user -r requirements.txt
 
 # Copy application code
-COPY . /app
+COPY --chown=user:user . /app
 
-# Set ownership and permissions
-RUN chown -R user:user /app && \
-    chmod -R 755 uploads
-
-# Switch to user
-USER user
-ENV PATH="/home/user/.local/bin:$PATH"
+# Create upload directories
+RUN mkdir -p uploads/source_images uploads/target_videos uploads/result_videos uploads/output
 
 # Set environment variables
 ENV PYTHONUNBUFFERED=1
-ENV CUDA_VISIBLE_DEVICES=0
 
 # Expose port 7860 (required for Hugging Face Spaces)
 EXPOSE 7860
 
 # Run the API server on port 7860 (HF Spaces requirement)
-CMD ["python3", "-m", "uvicorn", "api_server:app", "--host", "0.0.0.0", "--port", "7860"]
+CMD ["python", "-m", "uvicorn", "api_server:app", "--host", "0.0.0.0", "--port", "7860"]