Diagnose StorePilot's store credentials and report exactly what is missing.

Runs every setup step independently and reports all of them, so a single failure never hides the rest. For Google Play it verifies: the service account key parses (and shows the email you must grant access to), the Android Publisher API is reachable, the Play Developer Reporting API is reachable and lists your apps, the "Reply to reviews" permission is present (the API returns an empty list rather than an error when it is missing), and the Cloud Storage reports bucket is configured and readable. Each failing step comes with the exact fix. Run this first whenever a Play tool returns empty or unexpected data.