reordered Dockerfile for faster reloads on backend dev

Dockerfile

@@ -21,13 +21,6 @@ RUN pip install poetry
 RUN mkdir -p /app/.cache && \
     chown -R user:user /app
 
-# Copy and install backend dependencies
-COPY backend/pyproject.toml backend/poetry.lock* ./
-RUN poetry config virtualenvs.create false \
-    && poetry install --no-interaction --no-ansi --no-root --only main
-
-# Copy backend code
-COPY backend/ .
 
 # Install Node.js and npm
 RUN apt-get update && apt-get install -y \
@@ -47,6 +40,14 @@ WORKDIR /app/frontend
 RUN npm install --production
 WORKDIR /app
 
+# Copy and install backend dependencies
+COPY backend/pyproject.toml backend/poetry.lock* ./
+RUN poetry config virtualenvs.create false \
+    && poetry install --no-interaction --no-ansi --no-root --only main
+
+# Copy backend code
+COPY backend/ .
+
 # Environment variables
 ENV HF_HOME=/app/.cache \
     HF_DATASETS_CACHE=/app/.cache \
@@ -59,4 +60,4 @@ USER user
 EXPOSE 7860
 
 # Start both servers with wait-for
-CMD ["sh", "-c", "uvicorn app.asgi:app --host 0.0.0.0 --port 7861 & while ! nc -z localhost 7861; do sleep 1; done && cd frontend && npm run serve"]
+CMD ["sh", "-c", "uvicorn app.asgi:app --host 0.0.0.0 --port 7861 & while ! nc -z localhost 7861; do sleep 1; done && cd frontend && npm run serve"]