Add the server side of Android App Links (M9 follow-up, docs/android/APP_LINKS.md):
- GET /.well-known/assetlinks.json at the web root, gated by the new admin
setting `mobile_app_links_enabled` (default off -> 404; on-but-no-fingerprint
-> 404). Emits the Digital Asset Links statement for the fixed published
package (MOBILE_APP_PACKAGE) + MOBILE_APP_CERT_SHA256 fingerprint(s).
- mobileSso `/start` additionally accepts this shard's own self-origin
https://<host>/mobile/callback when App Links are enabled — one additive
exact-match entry, derived from APP_BASE_URL/request origin, never client
input; the custom-scheme allowlist is never narrowed. The settings lookup is
short-circuited for non-https redirects so custom-scheme rejections stay fast.
- settings.isMobileAppLinksEnabled() (fail-closed) + getPublic().mobileAppLinks;
admin updateSettings validates the boolean; seed default off.
Tests: test/appLinks.test.js (route gating + allowlist). Full suite 284 pass.
Swagger unchanged (web-root verification file is #swagger.ignore'd).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NgyHnrNa8WwG3doxvxjuCr
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