feat: WC Settings API, compatibility refactor, HPOS fix (#1002)

* feat: WC Settings API, compatibility refactor, HPOS fix, CI improvements

WC Settings GraphQL API:
- Add WCSetting interface with common fields and type-safe resolveType
- Add concrete types: WCStringSetting, WCArraySetting, WCRelativeDateSetting,
  WCImageWidthSetting with typed value/default fields
- Add WCSettingGroup type with nested settings field
- Add wcSettingGroups and wcSettings root query fields (admin only)
- Add updateWCSetting and updateWCSettings mutations
- Dynamic WCSettingTypeEnum collected from registered WC settings
- Filters: graphql_woocommerce_setting_type_map, graphql_woocommerce_setting_types
- Register WC admin settings for GraphQL requests via Compatibility class

Compatibility refactor:
- Consolidate ACF, JWT Auth, and QL Search filters into Compatibility class
- Remove class-acf-schema-filters.php, class-jwt-auth-schema-filters.php, functions.php

HPOS compatibility fix:
- Replace hardcoded directory name check with dirname(__DIR__) === WP_PLUGIN_DIR
- Works with any plugin folder name while still skipping nested vendor installs

CI improvements:
- Remove STRIPE_API_PUBLISHABLE_KEY restriction from coverage job
- Add HPOS to coverage matrix entries
- Sort type registry and includes alphabetically

Other fixes:
- Fix Settings_Mutation::validate_setting_checkbox_field to be static
- Update ShippingZone settings field type to WCStringSetting

Closes #864, closes #969

* refactor: Rename and split core classes, add order cursor pagination tests

Class renames:
- WooCommerce_Filters → WooCommerce (class-woocommerce.php), setup() → init()
- Core_Schema_Filters → Post_Types (class-post-types.php)

Class split:
- Extract taxonomy registration from Core_Schema_Filters into Taxonomies (class-taxonomies.php)

Access functions:
- Add wc_graphql_resolve_product_type() for interface resolveType callbacks
- Add wc_graphql_is_session_handler_disabled()
- Add wc_graphql_enabled_authorizing_url_fields()
- Add wc_graphql_get_authorizing_url_nonce_param_name()
- Replace direct class references with global functions in type-registry,
  compatibility, protected-router, and all product interface files

Stripe gateway compatibility:
- Move woographql_stripe_gateway_args from WooCommerce to Compatibility class
- Rename to woocommerce_gateway_stripe_args

Tests:
- Add OrderCursorPaginationTest (6 tests) covering COT cursor-based
  pagination: forward/backward, date ordering ASC/DESC, cursor integrity

* fix: Use proper expectedField/expectedNode assertions in cursor pagination tests

Replace empty assertQuerySuccessful([]) calls and manual lodashGet
assertions with expectedField, expectedNode, and not()->expectedNode()
for proper GraphQL response validation.

access-functions.php

@@ -370,3 +370,51 @@ if ( ! function_exists( 'woographql_verify_nonce' ) ) :
 	}
 
 endif;
+
+if ( ! function_exists( 'wc_graphql_resolve_product_type' ) ) {
+	/**
+	 * Resolves GraphQL type for provided product model.
+	 *
+	 * @param mixed $value Product model.
+	 *
+	 * @return mixed
+	 */
+	function wc_graphql_resolve_product_type( $value ) {
+		return \WPGraphQL\WooCommerce\Post_Types::resolve_product_type( $value );
+	}
+}
+
+if ( ! function_exists( 'wc_graphql_is_session_handler_disabled' ) ) {
+	/**
+	 * Returns true if the QL Session Handler is disabled.
+	 *
+	 * @return boolean
+	 */
+	function wc_graphql_is_session_handler_disabled() {
+		return \WPGraphQL\WooCommerce\WooCommerce::is_session_handler_disabled();
+	}
+}
+
+if ( ! function_exists( 'wc_graphql_enabled_authorizing_url_fields' ) ) {
+	/**
+	 * Returns array of enabled authorizing URL field slugs.
+	 *
+	 * @return array
+	 */
+	function wc_graphql_enabled_authorizing_url_fields() {
+		return \WPGraphQL\WooCommerce\WooCommerce::enabled_authorizing_url_fields();
+	}
+}
+
+if ( ! function_exists( 'wc_graphql_get_authorizing_url_nonce_param_name' ) ) {
+	/**
+	 * Return the nonce query parameter name for the provided field.
+	 *
+	 * @param string $field  URL field slug.
+	 *
+	 * @return string|null
+	 */
+	function wc_graphql_get_authorizing_url_nonce_param_name( $field ) {
+		return \WPGraphQL\WooCommerce\WooCommerce::get_authorizing_url_nonce_param_name( $field );
+	}
+}