feat: add invite rewards and redeem codes

infra/scripts/generate-redeem-codes.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/../.." && pwd)"
+ENV_FILE="$ROOT_DIR/.env"
+ENV_LOADER="$ROOT_DIR/infra/scripts/lib/env.sh"
+
+if [ ! -f "$ENV_FILE" ]; then
+  echo "Error: env file not found at $ENV_FILE" >&2
+  exit 1
+fi
+
+# shellcheck disable=SC1090
+. "$ENV_LOADER"
+load_env_file "$ENV_FILE"
+load_env_file "$ROOT_DIR/.env.local"
+
+cd "$ROOT_DIR"
+PYTHONPATH=backend/src uv run python infra/scripts/generate_redeem_codes.py "$@"