Wire Firebase Web config and VAPID through build-args/dart-define,
populate firebase-messaging-sw.js at image build, and soft-fallback to
install: tokens when secrets are absent. Live accept still needs Master
.env FIREBASE_* values and a web rebuild.
Co-authored-by: okuma <o0kuma@users.noreply.github.com>
Add PushTokenService with Firebase Messaging fallback to install
placeholders, conditional google-services Gradle plugin, fcm-setup.md,
and mark Android UI checklist api-done via prod e2e 16/16.
Co-authored-by: okuma <o0kuma@users.noreply.github.com>
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