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/support/test_support.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:tane/data/species_repository.dart';
 import 'package:tane/data/variety_repository.dart';
 import 'package:tane/db/database.dart';
 import 'package:tane/i18n/strings.g.dart';
@@ -29,6 +30,9 @@ VarietyRepository newTestRepository(
   String nodeId = 'test-node',
 }) => VarietyRepository(db, idGen: IdGen(), nodeId: nodeId);
 
+SpeciesRepository newTestSpeciesRepository(AppDatabase db) =>
+    SpeciesRepository(db, idGen: IdGen());
+
 /// Wraps [child] with the providers a screen expects (repository, inventory
 /// cubit) plus i18n and Material localizations, pinned to [locale].
 Widget wrapScreen({
@@ -61,12 +65,16 @@ Widget wrapScreen({
 Widget wrapDetail({
   required VarietyRepository repository,
   required String varietyId,
+  SpeciesRepository? species,
   AppLocale locale = AppLocale.en,
 }) {
   LocaleSettings.setLocaleSync(locale);
   return TranslationProvider(
-    child: RepositoryProvider.value(
-      value: repository,
+    child: MultiRepositoryProvider(
+      providers: [
+        RepositoryProvider.value(value: repository),
+        if (species != null) RepositoryProvider.value(value: species),
+      ],
       child: BlocProvider(
         create: (_) => VarietyDetailCubit(repository, varietyId),
         child: MaterialApp(