fix: use port 7860 for Hugging Face Spaces compatibility

Hugging Face Spaces expects applications to run on port 7860.
Updated EXPOSE and uvicorn port from 8000 to 7860.

Co-Authored-By: Claude (glm-4.7) <noreply@anthropic.com>

Dockerfile

@@ -26,7 +26,8 @@ FROM python:3.13-slim
 # Set environment variables
 ENV PYTHONUNBUFFERED=1 \
     PYTHONDONTWRITEBYTECODE=1 \
-    PATH="/app/.venv/bin:$PATH"
+    PATH="/app/.venv/bin:$PATH" \
+    PORT=7860
 
 # Create non-root user
 RUN groupadd -r appuser -g 1000 && \
@@ -59,12 +60,12 @@ COPY --chown=appuser:appuser uvicorn_config.py .
 # Switch to non-root user
 USER appuser
 
-# Expose port 8000
-EXPOSE 8000
+# Expose port 7860 (Hugging Face Spaces default)
+EXPOSE 7860
 
 # Health check
 HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
-    CMD curl -f http://localhost:8000/health || exit 1
+    CMD curl -f http://localhost:7860/health || exit 1
 
-# Run the application with uvicorn
-CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]
+# Run the application with uvicorn on port 7860
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]