Update Dockerfile

Dockerfile

@@ -12,8 +12,8 @@ RUN npm install --frozen-lockfile
 COPY frontend/ ./
 RUN npm run build
 
-# --- Stage 2: GPU-enabled Python backend ---
-FROM nvidia/cuda:12.1.1-cudnn8-runtime-ubuntu22.04 AS backend
+# --- Stage 2: Python backend (CPU only) ---
+FROM python:3.10-slim AS backend
 
 # Environment setup
 ENV DEBIAN_FRONTEND=noninteractive \
@@ -22,9 +22,9 @@ ENV DEBIAN_FRONTEND=noninteractive \
     PIP_NO_CACHE_DIR=1 \
     HF_HOME=/app/.cache/huggingface
 
-# Install system dependencies BEFORE switching user
+# Install system dependencies
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    python3 python3-pip python3-venv git curl && \
+    git curl && \
     rm -rf /var/lib/apt/lists/*
 
 # Create non-root user
@@ -40,13 +40,10 @@ USER appuser
 
 WORKDIR /app
 
-# Upgrade pip and install CUDA-enabled PyTorch
-RUN python3 -m pip install --upgrade pip && \
-    python3 -m pip install --index-url https://download.pytorch.org/whl/cu121 torch==2.4.1+cu121
-
-# Install Python dependencies
+# Upgrade pip and install Python dependencies
 COPY backend/requirements.txt /app/backend/requirements.txt
-RUN python3 -m pip install -r /app/backend/requirements.txt
+RUN python3 -m pip install --upgrade pip && \
+    python3 -m pip install -r /app/backend/requirements.txt
 
 # Copy backend code
 COPY backend/ /app/backend/