refactor: consolidate codebase into clean architecture

- Remove duplicate features structure from basura_app
- Migrate recycling_guide feature to lib/
- Update main.dart to use new architecture
- Clean up old views structure
- Remove temporary directories (basura_app, basura_backend, wiki_hackathon)

lib/features/recycling_guide/data/datasources/recycling_local_datasource.dart

@@ -0,0 +1,46 @@
+// lib/features/recycling_guide/data/datasources/recycling_local_datasource.dart
+// Único archivo que sabe que los datos vienen de un JSON en assets.
+// Funciona sin conexión a internet.
+
+import 'dart:convert';
+import 'package:flutter/services.dart';
+import '../../domain/entities/recycling_category.dart';
+
+class RecyclingLocalDatasource {
+  static const _assetPath = 'assets/recycling_guide.json';
+
+  // Cache en memoria — se carga una sola vez durante la sesión
+  List<RecyclingCategory>? _cache;
+
+  Future<List<RecyclingCategory>> cargarCategorias() async {
+    if (_cache != null) return _cache!;
+
+    final raw = await rootBundle.loadString(_assetPath);
+    final List<dynamic> json = jsonDecode(raw);
+
+    _cache = json.map(_mapearCategoria).toList();
+    return _cache!;
+  }
+
+  RecyclingCategory _mapearCategoria(dynamic json) {
+    final items = (json['items'] as List)
+        .map(
+          (i) => RecyclingItem(
+            nombre: i['nombre'] as String,
+            ejemplos: i['ejemplos'] as String,
+            acepta: i['acepta'] as bool,
+          ),
+        )
+        .toList();
+
+    return RecyclingCategory(
+      id: json['id'] as String,
+      nombre: json['nombre'] as String,
+      descripcion: json['descripcion'] as String,
+      colorHex: json['color'] as String,
+      icono: json['icono'] as String,
+      consejo: json['consejo'] as String,
+      items: items,
+    );
+  }
+}