refactor: 程式碼品質優化、LangChain 遷移與內容擴充 #85
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## 安全性修復 - 修復 8 個檔案中的 eval() 安全性問題，改用 ast 模組進行安全計算 - 涵蓋 MCP、Agent、RAG 等模組的計算器工具 ## 內容更新 - 更新 10+ 個檔案中過時的 gpt-3.5-turbo 參考至 gpt-4o-mini - 更新價格表至 2025 年版本 ## 新增內容 - 企業級 MLOps 完整指南：成熟度模型、Feature Store、Kubeflow Pipeline、藍綠部署 - 知識圖譜應用指南：GraphRAG、多跳推理、知識更新策略 - AI 倫理與法規指南：EU AI Act、公平性分析、隱私保護、合規框架 ## 新增實戰專案 - VLM 圖像分析系統：多 VLM 提供者支援、文件分析、圖表數據提取
## LangChain 依賴更新 - rag_agent_system.py: langchain.chat_models → langchain_openai - CONTRIBUTING.md: langchain.llms → langchain_openai ## 異常處理改進 - 06_model_comparison.py: 修復 4 個 bare except - 03_gemini_basic.py: 修復 2 個 bare except - 01_llama31_complete.py: 修復 1 個 bare except - 02_crewai_multi_agent.py: 修復 1 個 bare except 所有 bare except 改為具體異常類型以提升可調試性
主要更新： - 修復 5 處 bare except，使用具體異常類型 (Exception, AttributeError 等) - 更新 LangChain imports 至最新版本： - langchain.vectorstores → langchain_community.vectorstores - langchain.embeddings → langchain_openai / langchain_huggingface - langchain.llms → langchain_openai - langchain.chat_models → langchain_openai - 更新過時的 API 參考： - text-davinci-003 → gpt-4o-mini (使用新 SDK) - gpt-4-turbo-preview → gpt-4o - gpt-4-vision-preview → gpt-4o (支援多模態) 影響檔案：14 個
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Summary
eval()替換為安全的ast.literal_eval()langchain.vectorstores→langchain_community.vectorstoreslangchain.embeddings→langchain_openai/langchain_huggingfacelangchain.llms→langchain_openailangchain.chat_models→langchain_openaitext-davinci-003→gpt-4o-mini(使用新版 SDK)gpt-4-turbo-preview→gpt-4ogpt-4-vision-preview→gpt-4o(多模態支援)Test plan