feat: Move Dockerfile to root for HF Spaces

Dockerfile

@@ -0,0 +1,25 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    tesseract-ocr \
+    poppler-utils \
+    nodejs \
+    npm \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY backend/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY backend/ ./backend/
+COPY frontend/ ./frontend/
+
+RUN cd frontend && npm install && npm run build
+
+RUN mkdir -p /app/storage/uploads /app/storage/vector_db
+
+EXPOSE 7860
+
+CMD ["bash", "-c", "cd backend && uvicorn app.main:app --host 0.0.0.0 --port 7860 & cd frontend && npx serve -s dist -l 7861"]