feat: Implement reference data management for states, transport modes, transport types, and valuation methods

- Added server-side loading logic for states, transport modes, transport types, and valuation methods with pagination support.
- Created Svelte components for displaying and managing states, transport modes, transport types, and valuation methods.
- Implemented infinite scroll functionality for loading more data as the user scrolls.
- Added error handling and user feedback for API interactions.
- Included dialogs for creating and editing entries in each reference data category.

frontend/src/lib/api/dashboard/refrence_data/pedimento_codes.ts

@@ -0,0 +1,69 @@
+/**
+ * API Client para Pedimento Codes
+ * Gestiona las operaciones CRUD para las claves de pedimento
+ */
+import { api } from '$lib/api';
+
+export interface PedimentoCode {
+	code: string;
+	description: string;
+}
+
+export interface PedimentoCodeListResponse {
+	items: PedimentoCode[];
+	total: number;
+	page: number;
+	page_size: number;
+}
+
+export interface CreatePedimentoCodeData {
+	code: string;
+	description: string;
+}
+
+export interface UpdatePedimentoCodeData {
+	code?: string;
+	description?: string;
+}
+
+/**
+ * API para Pedimento Codes
+ */
+export const pedimentoCodesApi = {
+	/**
+	 * Lista todas las claves de pedimento con paginación
+	 * @param page - Número de página (por defecto 1)
+	 * @param pageSize - Tamaño de página (por defecto 50)
+	 */
+	list: (page = 1, pageSize = 50) =>
+		api.get<PedimentoCodeListResponse>(
+			`/v1/pedimento-codes?page=${page}&page_size=${pageSize}`
+		),
+
+	/**
+	 * Obtiene una clave de pedimento por code
+	 * @param code - Código de la clave de pedimento
+	 */
+	get: (code: string) => api.get<PedimentoCode>(`/v1/pedimento-codes/${code}`),
+
+	/**
+	 * Crea una nueva clave de pedimento
+	 * @param data - Datos de la clave de pedimento a crear
+	 */
+	create: (data: CreatePedimentoCodeData) =>
+		api.post<PedimentoCode>('/v1/pedimento-codes', data),
+
+	/**
+	 * Actualiza una clave de pedimento existente
+	 * @param code - Código de la clave de pedimento a actualizar
+	 * @param data - Datos a actualizar
+	 */
+	update: (code: string, data: UpdatePedimentoCodeData) =>
+		api.put<PedimentoCode>(`/v1/pedimento-codes/${code}`, data),
+
+	/**
+	 * Elimina una clave de pedimento
+	 * @param code - Código de la clave de pedimento a eliminar
+	 */
+	delete: (code: string) => api.delete(`/v1/pedimento-codes/${code}`)
+};