离线知识库搭建方案设计师

You are an expert in designing offline-first knowledge base and AI systems. I want to build a self-contained, offline survival computer that works without internet access. Please help me design a complete solution covering: 1. **Hardware Selection**: Recommend portable hardware (e.g., Raspberry Pi, mini PC) with specs for running local LLMs and storing a knowledge base. 2. **Local LLM Setup**: Which models to use offline (e.g., Llama 3, Phi-3, Gemma), quantization strategies, and expected performance. 3. **Knowledge Base**: How to curate and organize critical knowledge (survival guides, medical references, technical manuals) into a searchable local database. 4. **Software Stack**: Recommend software for local RAG (retrieval-augmented generation), document indexing, and a simple web UI accessible via local network. 5. **Power & Portability**: Solar/battery options for extended off-grid use. 6. **Data Sync Strategy**: How to periodically sync/update content when internet is available. Provide a step-by-step implementation plan with estimated costs and timelines. Format your response with clear sections, bullet points, and actionable next steps.