Add encrypted day storage and personal backups

src/helpers.php

@@ -352,6 +352,37 @@ function base64url_decode(string $data): string
     return $decoded;
 }
 
+function uploaded_files(string $field): array
+{
+    $raw = $_FILES[$field] ?? null;
+    if (!is_array($raw) || !isset($raw['name'])) {
+        return [];
+    }
+
+    if (!is_array($raw['name'])) {
+        return [[
+            'name' => (string) ($raw['name'] ?? ''),
+            'type' => (string) ($raw['type'] ?? ''),
+            'tmp_name' => (string) ($raw['tmp_name'] ?? ''),
+            'error' => (int) ($raw['error'] ?? UPLOAD_ERR_NO_FILE),
+            'size' => (int) ($raw['size'] ?? 0),
+        ]];
+    }
+
+    $files = [];
+    foreach ($raw['name'] as $index => $name) {
+        $files[] = [
+            'name' => (string) ($name ?? ''),
+            'type' => (string) ($raw['type'][$index] ?? ''),
+            'tmp_name' => (string) ($raw['tmp_name'][$index] ?? ''),
+            'error' => (int) ($raw['error'][$index] ?? UPLOAD_ERR_NO_FILE),
+            'size' => (int) ($raw['size'][$index] ?? 0),
+        ];
+    }
+
+    return $files;
+}
+
 function normalize_sport_type_id(string $value): string
 {
     $value = trim(strtr($value, [