fix(rajaongkir): fix relative endpoint path and increase min_chars to 3

- search_endpoint changed from '/woonoow/v1/rajaongkir/destinations'
  to '/rajaongkir/destinations' (relative to API base)
- min_chars increased from 2 to 3 to reduce early API hits

RAJAONGKIR_INTEGRATION.md

@@ -50,7 +50,7 @@ add_action('rest_api_init', function() {
 function woonoow_rajaongkir_search_destinations($request) {
     $search = sanitize_text_field($request->get_param('search') ?? '');
     
-    if (strlen($search) < 2) {
+    if (strlen($search) < 3) {
         return [];
     }
     
@@ -112,9 +112,10 @@ add_filter('woocommerce_checkout_fields', function($fields) {
         'class'           => ['form-row-wide'],
         'placeholder'     => __('Search destination...', 'woonoow'),
         // WooNooW-specific: API endpoint configuration
-        'search_endpoint' => '/woonoow/v1/rajaongkir/destinations',
+        // NOTE: Path is relative to /wp-json/woonoow/v1
+        'search_endpoint' => '/rajaongkir/destinations',
         'search_param'    => 'search',
-        'min_chars'       => 2,
+        'min_chars'       => 3,
         // Custom attribute to indicate this is for Indonesia only
         'custom_attributes' => [
             'data-show-for-country' => 'ID',