refactor: replace custom CRM with Monica fork

app/Http/Controllers/DAV/Backend/CardDAV/AddressBookHome.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Http\Controllers\DAV\Backend\CardDAV;
+
+use Sabre\CardDAV\AddressBookHome as BaseAddressBookHome;
+
+class AddressBookHome extends BaseAddressBookHome
+{
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    public function getACL()
+    {
+        return [
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => '{DAV:}owner',
+                'protected' => true,
+            ],
+        ];
+    }
+
+    /**
+     * Returns a list of addressbooks.
+     *
+     * @return array
+     */
+    public function getChildren()
+    {
+        $addressBooks = $this->carddavBackend->getAddressBooksForUser($this->principalUri);
+
+        return collect($addressBooks)->map(function (array $addressBook): AddressBook {
+            return new AddressBook($this->carddavBackend, $addressBook);
+        })->toArray();
+    }
+}