feat: add iCloud integration

db/migration/005_create_icloud_accounts.php

@@ -0,0 +1,21 @@
+<?php
+declare(strict_types=1);
+
+return function (PDO $db): void {
+    $db->exec("PRAGMA foreign_keys = ON;");
+
+    $db->exec("
+        CREATE TABLE IF NOT EXISTS icloud_accounts (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER NOT NULL,
+            remote_name TEXT NOT NULL UNIQUE,
+            apple_id TEXT NOT NULL,
+            trust_token TEXT,
+            cookies TEXT,
+            status TEXT NOT NULL DEFAULT 'pending',
+            connected_at INTEGER,
+            created_at INTEGER NOT NULL,
+            FOREIGN KEY(user_id) REFERENCES users(id)
+        );
+    ");
+};