Initial import of f7cloud-mobile native Android app.

Kotlin/Compose client for F7cloud (mail, files, talk, calendar, contacts, tasks, support).
Current version: 0.5.113 (build 121).

NOTICE.md

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+# Third-Party Notices — F7cloud Mobile
+
+## Nextcloud Talk for Android
+
+F7cloud Mobile integrates components derived from and/or intended to interoperate with
+[Nextcloud Talk for Android](https://github.com/nextcloud/talk-android).
+
+- **Version vendored:** v23.0.0
+- **Location:** `vendor/talk-android/`
+- **License:** GNU General Public License v3.0 or later (GPL-3.0-or-later)
+- **Copyright:** Nextcloud GmbH and Nextcloud contributors
+
+The full source code of Nextcloud Talk for Android is available at:
+https://github.com/nextcloud/talk-android/tree/v23.0.0
+
+When native Talk modules from this codebase are linked into F7cloud Mobile, the combined
+work is distributed under the terms of the GPL-3.0-or-later. Corresponding source code
+will be made available alongside this application.
+
+## Firebase Cloud Messaging
+
+Push notifications use Google Firebase Cloud Messaging (proprietary Google SDK).