feat(block1): bundled species catalog + autocomplete link

Add a small curated catalog of Iberian horticultural species and let a variety
be linked to it from the edit sheet.

- assets/catalog/species.json: 14 species with botanical family and ES/EN
  common names (wikidata_qid/gbif_key deferred to the varilla enrichment).
- SpeciesRepository: idempotent seedBundled (is_bundled rows, keyed by
  scientific name) + search by scientific/common name with a locale-best label.
  Seeded on startup from DI.
- VarietyRepository.linkSpecies: sets species_id and prefills category from the
  species' family when empty (never overwrites an existing category).
  VarietyDetail now carries the scientific name.
- Edit sheet gains a live species-search field; the detail view shows the
  scientific name (italic). i18n strings added (ES/EN).

Tests: catalog parse, idempotent seeding, search by scientific/common name,
linkSpecies prefill semantics, and a widget test for the autocomplete → link →
scientific-name-shown flow. Full suite: 32 passing, 0 skipped.

apps/app_seeds/lib/main.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/widgets.dart';
 
 import 'app.dart';
+import 'data/species_repository.dart';
 import 'data/variety_repository.dart';
 import 'di/injector.dart';
 import 'i18n/strings.g.dart';
@@ -10,6 +11,11 @@ Future<void> main() async {
   LocaleSettings.useDeviceLocaleSync();
   await configureDependencies();
   runApp(
-    TranslationProvider(child: TaneApp(repository: getIt<VarietyRepository>())),
+    TranslationProvider(
+      child: TaneApp(
+        repository: getIt<VarietyRepository>(),
+        species: getIt<SpeciesRepository>(),
+      ),
+    ),
   );
 }