init: documentation and prototypes

prototype-grok4.1/direktvermittlungde-backend/requirements.txt

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+fastapi==0.104.1
+uvicorn[standard]==0.24.0
+sqlalchemy[asyncio]==2.0.23
+asyncpg==0.29.0
+aioboto3==12.4.0
+arq==0.18.4
+redis==5.0.1
+pydantic[email]==2.5.0
+python-jose[cryptography]==3.3.0
+python-multipart==0.0.6
+pytest==7.4.3
+pytest-asyncio==0.21.1
+httpx==0.25.2