Add f7push v0.1: FCM device registry and push API for F7cloud.

Portable occ-based config, OCS endpoints for APK registration, notification relay, and server-side push dispatch.

lib/Model/PushMessage.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\F7Push\Model;
+
+class PushMessage {
+	public function __construct(
+		public readonly string $userId,
+		public readonly string $title,
+		public readonly string $body,
+		public readonly string $source = 'f7push',
+		public readonly string $priority = 'normal',
+		public readonly ?string $url = null,
+	) {
+	}
+}