chore: add EDGE_TENANT_ID to .env.example

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ralyodio

.env.example

@@ -37,5 +37,6 @@ FIREFOX_JWT_SECRET=your-firefox-jwt-secret
 EDGE_PRODUCT_ID=your-edge-product-id
 EDGE_CLIENT_ID=your-edge-client-id
 EDGE_CLIENT_SECRET=your-edge-client-secret
+EDGE_TENANT_ID=your-edge-tenant-id
 
 GITHUB_PAT=your-github-pat