fix(docker): hybrid startup for FastAPI + Gradio with HF healthcheck

Dockerfile

@@ -6,7 +6,7 @@ ENV PYTHONUNBUFFERED=1 \
     PYTHONDONTWRITEBYTECODE=1 \
     PIP_NO_CACHE_DIR=1
 
-# ---------- Dependencies ----------
+# ---------- Install dependencies ----------
 COPY requirements.txt .
 RUN apt-get update && apt-get install -y --no-install-recommends curl && \
     pip install --no-cache-dir -r requirements.txt && \
@@ -15,13 +15,14 @@ RUN apt-get update && apt-get install -y --no-install-recommends curl && \
 # ---------- Copy app ----------
 COPY . .
 
-# ---------- Metadata & Healthcheck ----------
+# ---------- Metadata ----------
 LABEL org.opencontainers.image.title="nl2sql-copilot" \
-      org.opencontainers.image.description="NL2SQL Copilot full-stack demo (FastAPI + Gradio)" \
+      org.opencontainers.image.description="Hybrid FastAPI + Gradio demo for Hugging Face Spaces" \
       org.opencontainers.image.version="1.0.0"
 
+# ---------- Healthcheck ----------
 HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
-  CMD curl -fs http://localhost:8000/healthz || exit 1
+  CMD curl -fs http://localhost:7860/ || exit 1
 
 # ---------- Run both backend & frontend ----------
 EXPOSE 7860 8000