fix: restore Docker SDK with proper base_url and app_port configuration

- HF Spaces only supports: gradio, docker, static, streamlit (NOT jupyterlab)
- Added app_port: 7860 to README.md (required for docker SDK)
- Added --ServerApp.base_url=/ to Dockerfile CMD (fixes iframe routing)
- This should resolve blank screen issue

Dockerfile

@@ -0,0 +1,34 @@
+# Official Jupyter PyTorch notebook with CUDA 12 (HF Spaces recommended)
+FROM quay.io/jupyter/pytorch-notebook:cuda12-latest
+
+# Switch to root for system packages
+USER root
+RUN apt-get update && apt-get install -y git curl wget && \
+    rm -rf /var/lib/apt/lists/*
+
+# Switch back to jovyan user (uid 1000)
+USER jovyan
+WORKDIR /home/jovyan
+
+# Install Python dependencies
+COPY --chown=jovyan:users requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy notebooks and source code
+COPY --chown=jovyan:users *.ipynb ./
+COPY --chown=jovyan:users src/ ./src/
+
+# Expose JupyterLab port
+EXPOSE 7860
+
+# Start JupyterLab with HF Spaces configuration
+CMD ["jupyter", "lab", \
+     "--ip=0.0.0.0", \
+     "--port=7860", \
+     "--no-browser", \
+     "--ServerApp.token=''", \
+     "--ServerApp.password=''", \
+     "--ServerApp.base_url=/", \
+     "--ServerApp.allow_origin='*'", \
+     "--ServerApp.allow_remote_access=True", \
+     "--ServerApp.disable_check_xsrf=True"]

README.md

@@ -3,12 +3,10 @@ title: FBMC Chronos-2 Zero-Shot Forecasting
 emoji: ⚡
 colorFrom: blue
 colorTo: green
-sdk: jupyterlab
-sdk_version: "4.0.0"
-app_file: inference_smoke_test.ipynb
+sdk: docker
+app_port: 7860
 pinned: false
 license: mit
-hardware: a10g-small
 ---
 
 # FBMC Flow-Based Market Coupling Forecasting