docs: add Android-app as the fifth repo to the org profile
Weave the native Android client through the profile README: fifth row in the pieces table, a second client branch in the architecture diagram, a "how it fits" note (API-only client, self-configuring URL, ntfy push, no Play Services), a Quick start section, a where-to-go-next pointer, and a CI badge. Co-Authored-By: Claude <noreply@anthropic.com>
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