Add HuggingFace Spaces deployment config

Dockerfile for Docker SDK deployment on HF Spaces (port 7860),
.dockerignore to keep image small, and README with Spaces metadata.

.dockerignore

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+frontend/
+.git/
+.env
+__pycache__/
+*.pyc
+venv/
+.venv/
+data/
+evaluation/
+.claude/
+node_modules/
+.next/
+*.md
+!README.md

Dockerfile

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install CPU-only PyTorch first (smaller footprint)
+RUN pip install --no-cache-dir torch --index-url https://download.pytorch.org/whl/cpu
+
+# Copy requirements and install
+COPY requirements-deploy.txt .
+RUN pip install --no-cache-dir -r requirements-deploy.txt
+
+# Copy application code
+COPY . .
+
+# HuggingFace Spaces expects port 7860
+EXPOSE 7860
+
+CMD ["uvicorn", "backend.app:app", "--host", "0.0.0.0", "--port", "7860"]

README.md

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+---
+title: HuggingFace Course RAG API
+emoji: 🤗
+colorFrom: yellow
+colorTo: purple
+sdk: docker
+app_port: 7860
+---
+
+# HuggingFace Course RAG - Backend API
+
+Multimodal RAG system over HuggingFace Learn courses.