feat(pos): selector de vehiculo con dropdowns — Ano > Marca > Modelo > Motor

Barra de 4 dropdowns arriba del catalogo que se habilitan en cascada.
Al completar los 4, muestra categorias y partes para ese vehiculo.
Boton de limpiar para resetear. Endpoint /years-all para cargar anos.
Estilos con design system tokens (ambos temas).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pos/blueprints/catalog_bp.py

@@ -92,6 +92,19 @@ def years():
     return _master_only(_do)
 
 
+@catalog_bp.route('/years-all', methods=['GET'])
+@require_auth('catalog.view')
+def years_all():
+    """Get all available years (for vehicle selector dropdown)."""
+    def _do(master):
+        cur = master.cursor()
+        cur.execute("SELECT DISTINCT id_year, year_car FROM years ORDER BY year_car DESC")
+        rows = cur.fetchall()
+        cur.close()
+        return jsonify({'data': [{'id_year': r[0], 'year_car': r[1]} for r in rows]})
+    return _master_only(_do)
+
+
 @catalog_bp.route('/engines', methods=['GET'])
 @require_auth('catalog.view')
 def engines():