feat: Add Shipping API controller

Created backend API for fetching WooCommerce shipping zones.

New Files:
- includes/Api/ShippingController.php

Features:
✅ GET /settings/shipping/zones endpoint
✅ Fetches all WooCommerce shipping zones
✅ Includes shipping methods for each zone
✅ Handles "Rest of the World" zone (zone 0)
✅ Returns formatted region names
✅ Returns method costs (Free, Calculated, or price)
✅ Permission check: manage_woocommerce

Data Structure:
- id: Zone ID
- name: Zone name
- order: Display order
- regions: Comma-separated region names
- rates: Array of shipping methods
  - id: Method instance ID
  - name: Method title
  - price: Formatted price or "Free"/"Calculated"
  - enabled: Boolean

Integration:
- Registered in Routes.php
- Uses WC_Shipping_Zones API
- Compatible with all WooCommerce shipping methods

includes/Api/Routes.php

@@ -9,6 +9,7 @@ use WooNooW\Api\AnalyticsController;
 use WooNooW\Api\AuthController;
 use WooNooW\API\PaymentsController;
 use WooNooW\API\StoreController;
+use WooNooW\Api\ShippingController;
 
 class Routes {
     public static function init() {
@@ -49,6 +50,10 @@ class Routes {
             // Store controller
             $store_controller = new StoreController();
             $store_controller->register_routes();
+            
+            // Shipping controller
+            $shipping_controller = new ShippingController();
+            $shipping_controller->register_routes();
         });
     }
 }

includes/Api/ShippingController.php

@@ -0,0 +1,153 @@
+<?php
+namespace WooNooW\Api;
+
+use WP_REST_Request;
+use WP_REST_Response;
+use WC_Shipping_Zones;
+
+class ShippingController extends BaseController {
+
+	protected $namespace = 'woonoow/v1';
+	protected $rest_base = 'settings/shipping';
+
+	public function register_routes() {
+		// Get shipping zones
+		register_rest_route(
+			$this->namespace,
+			'/' . $this->rest_base . '/zones',
+			array(
+				array(
+					'methods'             => \WP_REST_Server::READABLE,
+					'callback'            => array( $this, 'get_zones' ),
+					'permission_callback' => array( $this, 'check_permission' ),
+				),
+			)
+		);
+	}
+
+	/**
+	 * Get all shipping zones with their methods
+	 */
+	public function get_zones( WP_REST_Request $request ) {
+		try {
+			$zones_data = array();
+			
+			// Get all shipping zones
+			$zones = WC_Shipping_Zones::get_zones();
+			
+			foreach ( $zones as $zone_data ) {
+				$zone = WC_Shipping_Zones::get_zone( $zone_data['id'] );
+				
+				// Get zone locations (regions)
+				$locations = $zone->get_zone_locations();
+				$regions = array();
+				
+				foreach ( $locations as $location ) {
+					if ( $location->type === 'country' ) {
+						$countries = WC()->countries->get_countries();
+						$regions[] = $countries[ $location->code ] ?? $location->code;
+					} elseif ( $location->type === 'state' ) {
+						$states = WC()->countries->get_states( substr( $location->code, 0, 2 ) );
+						$regions[] = $states[ substr( $location->code, 3 ) ] ?? $location->code;
+					} elseif ( $location->type === 'continent' ) {
+						$continents = WC()->countries->get_continents();
+						$regions[] = $continents[ $location->code ]['name'] ?? $location->code;
+					} elseif ( $location->type === 'postcode' ) {
+						$regions[] = 'Postcode: ' . $location->code;
+					}
+				}
+				
+				// Get shipping methods for this zone
+				$shipping_methods = $zone->get_shipping_methods( true ); // true = enabled only
+				$rates = array();
+				
+				foreach ( $shipping_methods as $method ) {
+					$rate = array(
+						'id'          => $method->id . ':' . $method->instance_id,
+						'instance_id' => $method->instance_id,
+						'method_id'   => $method->id,
+						'name'        => $method->get_title(),
+						'enabled'     => $method->enabled === 'yes',
+					);
+					
+					// Get cost if available
+					if ( isset( $method->cost ) && $method->cost !== '' ) {
+						$rate['price'] = wc_price( $method->cost );
+					} elseif ( $method->id === 'free_shipping' ) {
+						$rate['price'] = __( 'Free', 'woonoow' );
+					} else {
+						$rate['price'] = __( 'Calculated', 'woonoow' );
+					}
+					
+					// Get method description if available
+					if ( method_exists( $method, 'get_method_description' ) ) {
+						$rate['description'] = $method->get_method_description();
+					}
+					
+					$rates[] = $rate;
+				}
+				
+				$zones_data[] = array(
+					'id'      => $zone_data['id'],
+					'name'    => $zone->get_zone_name(),
+					'order'   => $zone->get_zone_order(),
+					'regions' => ! empty( $regions ) ? implode( ', ', $regions ) : __( 'No regions', 'woonoow' ),
+					'rates'   => $rates,
+				);
+			}
+			
+			// Add "Rest of the World" zone (zone 0)
+			$zone_0 = new \WC_Shipping_Zone( 0 );
+			$shipping_methods = $zone_0->get_shipping_methods( true );
+			$rates = array();
+			
+			foreach ( $shipping_methods as $method ) {
+				$rate = array(
+					'id'          => $method->id . ':' . $method->instance_id,
+					'instance_id' => $method->instance_id,
+					'method_id'   => $method->id,
+					'name'        => $method->get_title(),
+					'enabled'     => $method->enabled === 'yes',
+				);
+				
+				if ( isset( $method->cost ) && $method->cost !== '' ) {
+					$rate['price'] = wc_price( $method->cost );
+				} elseif ( $method->id === 'free_shipping' ) {
+					$rate['price'] = __( 'Free', 'woonoow' );
+				} else {
+					$rate['price'] = __( 'Calculated', 'woonoow' );
+				}
+				
+				$rates[] = $rate;
+			}
+			
+			if ( ! empty( $rates ) ) {
+				$zones_data[] = array(
+					'id'      => 0,
+					'name'    => __( 'Rest of the World', 'woonoow' ),
+					'order'   => 9999,
+					'regions' => __( 'Locations not covered by other zones', 'woonoow' ),
+					'rates'   => $rates,
+				);
+			}
+			
+			return new WP_REST_Response( $zones_data, 200 );
+			
+		} catch ( \Exception $e ) {
+			return new WP_REST_Response(
+				array(
+					'error'   => 'fetch_failed',
+					'message' => $e->getMessage(),
+				),
+				500
+			);
+		}
+	}
+
+	/**
+	 * Check if user has permission to manage shipping
+	 */
+	public function check_permission() {
+		return current_user_can( 'manage_woocommerce' );
+	}
+}