Add Docker support for backend

- Add Dockerfile for Python 3.12-slim based backend image
- Add docker-compose.yml for service orchestration
- Add .dockerignore to optimize build context
- Include health check and reference docs in container

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,17 @@
+__pycache__/
+*.py[cod]
+venv/
+.venv/
+.env
+.env.local
+backend/.env
+backend/.env.local
+.idea/
+.vscode/
+.DS_Store
+.git/
+frontend/
+specs/
+test_files/
+*.md
+!reference_docs/**/*.md

backend/Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+# Install curl for healthcheck
+RUN apt-get update && apt-get install -y --no-install-recommends curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first for layer caching
+COPY backend/requirements.txt .
+
+# Install dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY backend/app/ ./app/
+
+# Copy reference docs into the image
+COPY reference_docs/ ./reference_docs/
+
+# Set reference docs path for container
+ENV REFERENCE_DOCS_PATH=/app/reference_docs
+
+EXPOSE 8000
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]

docker-compose.yml

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+services:
+  backend:
+    build:
+      context: .
+      dockerfile: backend/Dockerfile
+    ports:
+      - "8000:8000"
+    env_file:
+      - backend/.env
+    environment:
+      - HOST=0.0.0.0
+      - PORT=8000
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+    restart: unless-stopped