feat(pay): wire VIP-tier pricing into cost, gates, and download box

Resolve user-facing pay amounts via aksrt_get_user_pay_price (cash/points +
VIP1/2 tiers), surface pay_modo/pay_limit through download meta and REST policy,
and tighten content-visibility / download-box UX for member-only and purchase
gates while improving local stream throttle math.

inc/classes/class-aksrt-download.php

@@ -114,6 +114,11 @@ class AKSRT_Download {
         $paid_settings = AKSRT_Settings::get_paid_content_settings();
         $cost = aksrt_resource_download_cost($post);
         $uid = get_current_user_id();
+        $priced = function_exists('aksrt_get_user_pay_price') ? aksrt_get_user_pay_price($post, $uid) : null;
+        $pay_modo = is_array($priced)
+            ? ((($priced['modo'] ?? '0') === 'points') ? 'points' : '0')
+            : ((($meta['pay_modo'] ?? '0') === 'points') ? 'points' : '0');
+        $display_price = is_array($priced) ? (float) ($priced['amount'] ?? 0) : (float) ($meta['price'] ?? 0);
 
         $need_captcha = !empty($paid_settings['download_captcha']) || !empty($meta['require_captcha']);
         if ($need_captcha && function_exists('aksrt_is_captcha_enabled_for') && !aksrt_is_captcha_enabled_for('download')) {
@@ -122,7 +127,10 @@ class AKSRT_Download {
 
         return new WP_REST_Response([
             'post_id'         => $post_id,
-            'price'           => (float) $meta['price'],
+            'price'           => $display_price,
+            'base_price'      => is_array($priced) ? (float) ($priced['base'] ?? $display_price) : (float) ($meta['price'] ?? 0),
+            'pay_modo'        => $pay_modo,
+            'pay_limit'       => (int) ($meta['pay_limit'] ?? 0),
             'cost'            => $cost,
             'require_login'   => !empty($paid_settings['download_login']) || !empty($meta['require_login']) || (!empty($paid_settings['free_logged_show']) && $cost <= 0),
             'require_captcha' => $need_captcha,
@@ -139,7 +147,7 @@ class AKSRT_Download {
                     'type'        => $row['type'] ?? 'direct',
                     'has_extract' => $extract_code !== '',
                 ];
-            }, $meta['downloads'], array_keys($meta['downloads'])),
+            }, $meta['downloads'] ?? [], array_keys($meta['downloads'] ?? [])),
         ], 200);
     }
 
@@ -354,14 +362,25 @@ class AKSRT_Download {
         header('Content-Length: ' . (string) $size);
 
         $chunk = 1024 * 64; // 64KB
+        $sleep_us = 0;
         if ($speed_kb > 0) {
-            $chunk = max(1024, min($chunk, $speed_kb * 1024));
+            // Emit ~speed_kb KB per second using fixed 64KB chunks when possible.
+            $bytes_per_sec = max(1024, $speed_kb * 1024);
+            $chunk = min(1024 * 64, $bytes_per_sec);
+            $chunk = max(1024, $chunk);
+            // Sleep so chunk_bytes / second ≈ bytes_per_sec.
+            $sleep_us = (int) max(0, (int) round(($chunk / $bytes_per_sec) * 1000000) - 1000);
         }
 
         $fh = fopen($path, 'rb');
         if (!$fh) {
             $this->fail_410();
         }
+        // Disable output compression for accurate Content-Length / throttle.
+        if (function_exists('apache_setenv')) {
+            @apache_setenv('no-gzip', '1');
+        }
+        @ini_set('zlib.output_compression', 'Off');
         while (!feof($fh)) {
             $buf = fread($fh, $chunk);
             if ($buf === false) {
@@ -371,9 +390,8 @@ class AKSRT_Download {
             if (function_exists('flush')) {
                 flush();
             }
-            if ($speed_kb > 0) {
-                // Approximate throttle: sleep 1s per speed_kb window when chunk ~= speed_kb KB.
-                usleep(200000); // 0.2s per chunk for smoother throttle
+            if ($sleep_us > 0) {
+                usleep($sleep_us);
             }
         }
         fclose($fh);