feat: Add permission checks, fix search, fix document upload, fix linked documents always being loaded all at once instead of paged

packages/paperless_api/lib/src/models/permissions/user_permission_extension.dart

@@ -11,4 +11,20 @@ extension UserPermissionExtension on UserModel {
       v2: (_) => true,
     );
   }
+
+  bool hasPermissions(List<PermissionAction> actions, List<PermissionTarget> targets) {
+    return map(
+      v3: (user) {
+        final permissions = [
+          for (var action in actions)
+            for (var target in targets) [action, target].join("_")
+        ];
+        return permissions.every((requestedPermission) =>
+            user.userPermissions.contains(requestedPermission) ||
+            user.inheritedPermissions
+                .any((element) => element.split(".").last == requestedPermission));
+      },
+      v2: (_) => true,
+    );
+  }
 }