chore: 初始化项目与后端基础工程

backend/requirements.txt

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+fastapi==0.110.0
+uvicorn[standard]==0.27.0
+pydantic==2.6.0
+pydantic-settings==2.1.0
+sqlalchemy==2.0.25
+asyncpg==0.29.0
+alembic==1.13.0
+python-jose[cryptography]==3.3.0
+passlib[bcrypt]==1.7.4
+python-multipart==0.0.6
+openpyxl==3.1.2
+pandas==2.2.0
+openai==1.10.0
+python-dotenv==1.0.0
+structlog==24.1.0
+pytest==7.4.4
+pytest-asyncio==0.23.4
+httpx==0.26.0
+ruff==0.1.15
+black==23.12.1
+mypy==1.8.0