fix(search): reindex on a fresh Meilisearch

Deleting a missing <uid>_next index is accepted with 202 and fails inside the
task with index_not_found. That error was not treated as not-found, so the first
reindex aborted and search stayed unavailable until indexes existed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

services/api/internal/search/meili.go

@@ -77,6 +77,7 @@ func (m *Meili) wait(ctx context.Context, t taskRef) error {
 			Status string `json:"status"`
 			Error  *struct {
 				Message string `json:"message"`
+				Code    string `json:"code"`
 			} `json:"error"`
 		}
 		if err := m.do(ctx, http.MethodGet, fmt.Sprintf("/tasks/%d", t.TaskUID), nil, &task); err != nil {
@@ -88,6 +89,10 @@ func (m *Meili) wait(ctx context.Context, t taskRef) error {
 		case "failed", "canceled":
 			msg := task.Status
 			if task.Error != nil {
+				// Удаление отсутствующего индекса принимается (202) и падает уже в задаче.
+				if task.Error.Code == "index_not_found" {
+					return fmt.Errorf("%w: task %d: %s", ErrMeiliNotFound, t.TaskUID, task.Error.Message)
+				}
 				msg = task.Error.Message
 			}
 			return fmt.Errorf("meilisearch: task %d: %s", t.TaskUID, msg)