Add requirements.txt for Nixpacks subdirectory detection

backend/requirements.txt

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+annotated-doc==0.0.4
+annotated-types==0.7.0
+anyio==4.13.0
+backports.asyncio.runner==1.2.0
+bcrypt==3.2.2
+blinker==1.9.0
+certifi==2026.4.22
+cffi==2.0.0
+click==8.3.3
+colorama==0.4.6
+cryptography==47.0.0
+dnspython==2.8.0
+duckdb==1.5.2
+ecdsa==0.19.2
+email-validator==2.3.0
+exceptiongroup==1.3.1
+fastapi==0.136.1
+Flask==3.1.3
+gunicorn==23.0.0
+h11==0.16.0
+httpcore==1.0.9
+httpx==0.28.1
+idna==3.13
+iniconfig==2.3.0
+itsdangerous==2.2.0
+Jinja2==3.1.6
+MarkupSafe==3.0.3
+packaging==26.2
+passlib==1.7.4
+pluggy==1.6.0
+pyasn1==0.6.3
+pycparser==3.0
+pydantic==2.13.3
+pydantic_core==2.46.3
+Pygments==2.20.0
+pytest==9.0.3
+pytest-asyncio==1.3.0
+python-dotenv==1.2.2
+python-jose==3.5.0
+rsa==4.9.1
+six==1.17.0
+starlette==1.0.0
+tomli==2.4.1
+typing-inspection==0.4.2
+typing_extensions==4.15.0
+uvicorn==0.46.0
+Werkzeug==3.1.8

frontend/requirements.txt

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+Flask==3.1.3
+gunicorn==23.0.0
+httpx==0.28.1
+itsdangerous==2.2.0
+Jinja2==3.1.6
+MarkupSafe==3.0.3
+Werkzeug==3.1.8