feat(T03): OCR-Erfassung via OpenRouter Qwen2.5-VL + OCR UI with drag-and-drop

backend/app/config.py

@@ -33,6 +33,10 @@ class Settings(BaseSettings):
     APP_ENV: str = "development"
     MOBILE_DE_API_KEY: str = ""
     MOBILE_DE_SELLER_ID: str = ""
+    OPENROUTER_API_KEY: str = ""
+    OPENROUTER_BASE_URL: str = "https://openrouter.ai/api/v1"
+    OPENROUTER_OCR_MODEL: str = "qwen/qwen2.5-vl-72b-instruct"
+    MAX_FILE_SIZE_MB: int = 50
 
     @property
     def cors_origins_list(self) -> list[str]: