feat(admin): shipping list create, after-sale filters, order note/actions

Native pay ops UX: create shipping/after-sale from list pages with redirect
branching, after-sale order/type filters and merchant actions, JSON-safe
order admin notes, and complete/refund/close shortcuts.

inc/classes/class-aksrt-order-repository.php

@@ -232,6 +232,46 @@ class AKSRT_Order_Repository {
     /**
      * 更新订单状态（带状态机验证）
      */
+    /**
+     * Merge operator admin note into order note meta without destroying JSON payload.
+     */
+    public function update_admin_note(string $order_number, string $admin_note): bool {
+        global $wpdb;
+
+        $order = $this->get($order_number);
+        if (!$order) {
+            return false;
+        }
+
+        $raw = isset($order['note']) && is_string($order['note']) ? $order['note'] : '';
+        $decoded = $raw !== '' ? json_decode($raw, true) : null;
+        $admin_note = sanitize_textarea_field($admin_note);
+
+        if (is_array($decoded)) {
+            $decoded['admin_note'] = $admin_note;
+            $new_note = wp_json_encode($decoded, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+        } elseif ($raw !== '') {
+            $new_note = wp_json_encode([
+                'customer_note' => $raw,
+                'admin_note'    => $admin_note,
+            ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+        } else {
+            $new_note = wp_json_encode([
+                'admin_note' => $admin_note,
+            ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+        }
+
+        $result = $wpdb->update(
+            $this->table(),
+            ['note' => $new_note],
+            ['order_number' => $order_number],
+            ['%s'],
+            ['%s']
+        );
+
+        return $result !== false;
+    }
+
     public function update_status(string $order_number, string $new_status, array $extra = []): bool {
         global $wpdb;