Fix: CPU-only Dockerfile running showcase.py (no model/training)

Dockerfile

@@ -1,20 +1,32 @@
-FROM pytorch/pytorch:2.4.0-cuda12.4-cudnn9-runtime
+FROM python:3.12-slim
 
-RUN pip install --no-cache-dir transformers>=4.45.0 accelerate && \
-    pip install --no-cache-dir nest_asyncio peft trl \
-    pydantic fastapi uvicorn websockets httpx matplotlib
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends git curl && \
+    rm -rf /var/lib/apt/lists/*
 
-RUN pip install --no-cache-dir "openenv-core[core]>=0.2.2"
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh && \
+    mv /root/.local/bin/uv /usr/local/bin/uv && \
+    mv /root/.local/bin/uvx /usr/local/bin/uvx
 
 RUN useradd -m -u 1000 appuser
+
 WORKDIR /app
+
+COPY pyproject.toml uv.lock* ./
+RUN uv sync --no-install-project --no-editable || true
+
 COPY . .
-RUN mkdir -p /app/plots && chown -R appuser:appuser /app
+RUN uv sync --no-editable
+
+RUN chown -R appuser:appuser /app
+
 USER appuser
 
+ENV PATH="/app/.venv/bin:$PATH"
 ENV PYTHONPATH="/app/envs:/app:$PYTHONPATH"
 ENV AMBULANCE_DIFFICULTY="easy"
 
 EXPOSE 7860
 
-CMD ["sh", "-c", "python3 /app/train.py; echo 'Training done (exit $?). Serving plots...'; mkdir -p /app/plots && cd /app/plots && python3 -m http.server 7860"]
+# Showcase server: serves frontend + env API on one port
+CMD ["python", "showcase.py"]