Flip M7 Part 2 to landed (Android-app#15) and record the two implementation decisions: the direct-ntfy embedded distributor (no UnifiedPush library — the plan's stated likely path; foreground-service SSE, no second app, no Google Play Services), and the small additive push.ntfyUrl settings field the app needs to discover the relay (website#79). Document push.ntfyUrl + NTFY_PUBLIC_URL in BACKEND_DESIGN.md. Co-Authored-By: Claude <noreply@anthropic.com>