feat: integrate RAG rag_jrxml submodule and fix Anthropic API key

Add rag submodule for semantic JRXML chunk retrieval, refactor
retrieve node to use RAGSearcher, and fix missing api_key in
Anthropic SDK client initialization.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

requirements.txt

@@ -17,6 +17,9 @@ lxml>=5.3.0
 
 # 嵌入模型（本地）
 sentence-transformers>=3.0.0
+torch>=2.0.0
+huggingface_hub>=0.19.0
+tqdm>=4.65.0
 
 # 工具类
 python-dotenv>=1.0.0