Add initial Dockerfile for Docker-based Space

Dockerfile

@@ -0,0 +1,27 @@
+# Use a multi-stage build to optimize the image
+# Stage 1: Build the React frontend
+FROM node:18-alpine AS frontend-builder
+WORKDIR /app
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm install
+COPY frontend/ .
+RUN npm run build
+
+# Stage 2: Set up the FastAPI backend
+FROM python:3.9-slim
+WORKDIR /app
+COPY backend/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+COPY backend/ .
+COPY --from=frontend-builder /app/dist/ ./frontend/dist/
+
+# Expose port
+EXPOSE 7860
+
+# Environment variables
+ENV GEMINI_API_KEY=${GEMINI_API_KEY}
+
+# Run the app
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]
+
+