chore: project setup

.env.example

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+# Claude Vision API Key (optional — nur für KI-Analyse benötigt)
+ANTHROPIC_API_KEY=sk-ant-...

requirements.txt

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+fastapi==0.111.0
+uvicorn==0.29.0
+pillow>=11.0.0
+opencv-python-headless>=4.9.0
+imagehash==4.3.1
+python-dotenv==1.0.1
+anthropic==0.25.0
+pytest==8.1.1
+httpx==0.27.0