first-update

backend/requirements.txt

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+# FastAPI
+fastapi>=0.115.0
+uvicorn[standard]>=0.30.0
+python-multipart>=0.0.9
+
+# Database - SQLite (默认), PostgreSQL 可选
+sqlalchemy>=2.0.0
+alembic>=1.13.0
+# asyncpg>=0.29.0      # PostgreSQL 异步驱动（生产环境使用）
+# psycopg2-binary>=2.9.9  # PostgreSQL 同步驱动
+
+# Pydantic
+pydantic>=2.0.0
+pydantic-settings>=2.0.0
+
+# Redis - 可选，用于缓存/队列（开发环境可省略）
+# redis>=5.0.0
+
+# File Processing
+pdfplumber>=0.10.4
+python-docx>=1.1.0
+openpyxl>=3.1.2
+pandas>=2.2.0
+ebooklib>=0.5
+PyMuPDF>=1.24.0
+
+# LLM & Text
+langchain>=0.3.0
+langchain-community>=0.2.0
+langchain-openai>=0.1.0
+tiktoken>=0.7.0
+python-dotenv>=1.0.0
+
+# Utils
+python-dateutil>=2.8.2
+httpx>=0.27.0
+aiofiles>=23.2.1