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/app.dart

@@ -3,6 +3,7 @@ import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:go_router/go_router.dart';
 
+import 'data/species_repository.dart';
 import 'data/variety_repository.dart';
 import 'i18n/strings.g.dart';
 import 'state/inventory_cubit.dart';
@@ -14,10 +15,11 @@ import 'ui/variety_detail_screen.dart';
 /// go_router. The list is `/`; `/variety/:id` is a placeholder detail route
 /// (the full item screen is a follow-on story).
 class TaneApp extends StatelessWidget {
-  TaneApp({required this.repository, super.key})
+  TaneApp({required this.repository, required this.species, super.key})
     : _router = _buildRouter(repository);
 
   final VarietyRepository repository;
+  final SpeciesRepository species;
   final GoRouter _router;
 
   static GoRouter _buildRouter(VarietyRepository repository) {
@@ -44,8 +46,11 @@ class TaneApp extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return RepositoryProvider.value(
-      value: repository,
+    return MultiRepositoryProvider(
+      providers: [
+        RepositoryProvider.value(value: repository),
+        RepositoryProvider.value(value: species),
+      ],
       child: MaterialApp.router(
         onGenerateTitle: (context) => context.t.app.title,
         debugShowCheckedModeBanner: false,