Add Docker support and fix external access issues

🐳 Docker Configuration:
- Created Dockerfile for containerized API deployment
- Added docker-compose.api.yml for complete stack
- Added requirements.txt for Docker builds
- Added .dockerignore for optimized builds
- Configured external access on 0.0.0.0:8080

📚 Documentation Updates:
- Updated quickstart to reflect Neo4j already running
- Added Docker deployment tabs with external access info
- Updated REST API docs with Docker deployment options
- Clarified local vs external access deployment methods

🔧 Configuration:
- API_HOST=0.0.0.0 for external access in Docker
- Health checks and restart policies
- Proper networking and volume configuration
- Environment variable configuration

✅ Addresses user issues:
- REST API now accessible from outside the machine via Docker
- Documentation reflects actual infrastructure state
- Clear deployment options for different use cases

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

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

Dockerfile

@@ -0,0 +1,49 @@
+FROM python:3.10-slim
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    gcc \
+    g++ \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements and install Python dependencies
+COPY requirements.txt* ./
+RUN pip install --no-cache-dir \
+    fastapi \
+    uvicorn \
+    posthog \
+    qdrant-client \
+    sqlalchemy \
+    vecs \
+    ollama \
+    mem0ai \
+    requests \
+    httpx
+
+# Copy application code
+COPY . .
+
+# Create non-root user
+RUN useradd -m -u 1000 appuser && chown -R appuser:appuser /app
+USER appuser
+
+# Expose port
+EXPOSE 8080
+
+# Environment variables with defaults
+ENV API_HOST=0.0.0.0
+ENV API_PORT=8080
+ENV API_KEYS=mem0_dev_key_123456789,mem0_docker_key_987654321
+ENV ADMIN_API_KEYS=mem0_admin_key_111222333
+ENV RATE_LIMIT_REQUESTS=100
+ENV RATE_LIMIT_WINDOW_MINUTES=1
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
+  CMD curl -f http://localhost:8080/health || exit 1
+
+# Start the API server
+CMD ["python", "start_api.py"]