feat(species): auto-classify variety species from its label

Infer the catalog species a free-text variety label names ("Maiz de la
abuela" -> Zea mays) and prefill the category from the species family.

- Pure, testable matcher (domain/species_autoclassify.dart): whole-word,
  accent/case-insensitive, Unicode-aware (any script), longest-name-wins,
  ambiguous names left unclassified, light plural fold.
- Quick-add and draft naming auto-link the species when the field is empty
  (non-destructive; an explicit category is kept).
- Edit sheet offers a one-tap suggestion from the typed name.

Tests: matcher unit, repository integration, SpeciesRepository.classifyLabel,
and an edit-sheet widget test.

apps/app_seeds/lib/i18n/strings_es.g.dart

@@ -351,6 +351,7 @@ class _Translations$editVariety$es extends Translations$editVariety$en {
 	@override String get notes => 'Notas';
 	@override String get species => 'Especie (del catálogo)';
 	@override String get speciesHint => 'Buscar una especie…';
+	@override String get speciesSuggested => 'Sugerida por el nombre';
 	@override String get organic => 'Ecológica';
 	@override String get organicHint => 'Cultivada de forma ecológica (eco)';
 }
@@ -1080,6 +1081,7 @@ extension on TranslationsEs {
 			'editVariety.notes' => 'Notas',
 			'editVariety.species' => 'Especie (del catálogo)',
 			'editVariety.speciesHint' => 'Buscar una especie…',
+			'editVariety.speciesSuggested' => 'Sugerida por el nombre',
 			'editVariety.organic' => 'Ecológica',
 			'editVariety.organicHint' => 'Cultivada de forma ecológica (eco)',
 			'addLot.title' => 'Añadir lote',