hoàn thành bước tạo docker compose

backend/Dockerfile

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+# ── Stage 1: deps ─────────────────────────────────────────────────────────────
+FROM python:3.12-slim AS deps
+
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# ── Stage 2: runtime ──────────────────────────────────────────────────────────
+FROM python:3.12-slim AS runtime
+
+WORKDIR /app
+
+# Copy installed packages from deps stage
+COPY --from=deps /usr/local/lib/python3.12/site-packages /usr/local/lib/python3.12/site-packages
+COPY --from=deps /usr/local/bin /usr/local/bin
+
+# Copy application code
+COPY . .
+
+# Ensure entrypoint is executable
+RUN chmod +x entrypoint.sh
+
+# Upload directory (will be mounted as a Docker volume)
+RUN mkdir -p /uploads
+
+EXPOSE 8000
+
+ENTRYPOINT ["./entrypoint.sh"]