Scaffold project layout

.env.example

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+# SQLite database path
+QUIZ_DB_PATH=./quiz.db
+
+# Required cookie signing secret
+QUIZ_SECRET_KEY=change-me-to-a-random-secret
+
+# Required shared instructor password
+QUIZ_ADMIN_PASSWORD=change-me
+
+# Uvicorn bind settings
+QUIZ_HOST=127.0.0.1
+QUIZ_PORT=8001
+
+# Public URL used for student join links and QR codes
+QUIZ_PUBLIC_URL=https://quiz.ahkhan.me
+
+# Python logging level
+QUIZ_LOG_LEVEL=INFO