fixed docker file for dependency installs

backend/Dockerfile

@@ -31,10 +31,9 @@ WORKDIR /app
 # Copy dependency files
 COPY pyproject.toml poetry.lock ./
 
-# Install dependencies (using pip for simpler container)
-# Export to requirements.txt and install with pip for smaller image
-RUN poetry export -f requirements.txt --output requirements.txt --without-hashes \
-    && pip install --no-cache-dir --user -r requirements.txt \
+# Install dependencies using Poetry directly (simpler and more reliable)
+RUN poetry config virtualenvs.create false \
+    && poetry install --only main --no-interaction --no-ansi \
     && rm -rf $POETRY_CACHE_DIR
 
 # -----------------------------------------------------------------------------
@@ -54,12 +53,12 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 RUN groupadd --gid 1000 app \
     && useradd --uid 1000 --gid app --shell /bin/bash --create-home app
 
-# Copy Python packages from builder
-COPY --from=builder /root/.local /home/app/.local
+# Copy Python packages from builder (installed globally, not in user dir)
+COPY --from=builder /usr/local/lib/python3.11/site-packages /usr/local/lib/python3.11/site-packages
+COPY --from=builder /usr/local/bin /usr/local/bin
 
-# Set PATH to include user packages
-ENV PATH="/home/app/.local/bin:$PATH" \
-    PYTHONPATH=/app \
+# Set environment variables
+ENV PYTHONPATH=/app \
     PYTHONUNBUFFERED=1 \
     PYTHONDONTWRITEBYTECODE=1