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/test/ui/quick_add_flow_test.dart

@@ -15,7 +15,12 @@ void main() {
       final repo = newTestRepository(db);
 
       await tester.pumpWidget(
-        TranslationProvider(child: TaneApp(repository: repo)),
+        TranslationProvider(
+          child: TaneApp(
+            repository: repo,
+            species: newTestSpeciesRepository(db),
+          ),
+        ),
       );
       await tester.pumpAndSettle();