添加API依赖和配置文件

api/__init__.py

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+"""
+Life Echo API
+"""
+

api/requirements.txt

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+# FastAPI and Web Server
+fastapi==0.115.0
+uvicorn[standard]==0.32.0
+websockets==14.1
+python-multipart==0.0.12
+
+# LangChain and AI
+langchain==0.3.0
+langchain-openai==0.2.0
+langchain-community==0.3.0
+openai==1.54.0
+
+# Database
+sqlalchemy==2.0.36
+aiosqlite==0.20.0
+
+# PDF Generation
+reportlab==4.2.2
+weasyprint==62.3
+
+# Utilities
+pydantic==2.9.2
+pydantic-settings==2.5.2
+python-dotenv==1.0.1
+
+# Audio Processing (optional, for future ASR/TTS integration)
+# pydub==0.25.1
+# speech-recognition==3.10.4
+