post CLAUDE updates

had CLAUDE AI made suggestions and edits to code.
added all route and moves some requirements around.

backend/.env.example

@@ -0,0 +1,10 @@
+FLASK_ENV=development
+FLASK_DEBUG=True
+SECRET_KEY=your-secret-key-here
+MAX_CONTENT_LENGTH=104857600
+UPLOAD_FOLDER=uploaded
+OUTPUT_FOLDER=output
+VIRUSTOTAL_API_KEY=your-virustotal-api-key
+REDIS_URL=redis://localhost:6379/0
+CELERY_BROKER_URL=redis://localhost:6379/0
+CELERY_RESULT_BACKEND=redis://localhost:6379/0