fix(analytics): Corregir URLs en analytics usando post_name desde BD

Problema:
- URLs en analytics mostraban dominio incorrecto (HTTP_HOST)
- URLs usaban formato /?p=ID en lugar de permalinks

Solución:
- class-search-engine.php: Agregar propiedad $prefix, incluir p.post_name
  en 5 queries fetch, agregar helpers getSiteUrlFromDb(),
  getPermalinkStructure() y buildPermalink()
- search-endpoint.php: Obtener site_url y permalink_structure desde
  wp_options, construir URLs con post_name
- click-endpoint.php: Fallback de dest usando post_name desde BD

Archivos modificados:
- includes/class-search-engine.php
- api/search-endpoint.php
- api/click-endpoint.php

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

api/click-endpoint.php

@@ -0,0 +1,102 @@
+<?php
+/**
+ * Click Tracking Endpoint with SHORTINIT bypass
+ *
+ * This endpoint logs clicks and redirects to the destination.
+ * Use this directly via plugin URL for fastest tracking.
+ *
+ * @package ROI_APU_Search
+ */
+
+declare(strict_types=1);
+
+// BYPASS: Don't load full WordPress
+define('SHORTINIT', true);
+define('WP_USE_THEMES', false);
+
+// Find wp-load.php (go up from plugin directory)
+$wp_load = dirname(__FILE__, 5) . '/wp-load.php';
+
+if (!file_exists($wp_load)) {
+    // Fallback: try alternative paths
+    $wp_load = dirname(__FILE__, 6) . '/wp-load.php';
+    if (!file_exists($wp_load)) {
+        // Can't log, just redirect
+        $postId = isset($_GET['pid']) ? (int) $_GET['pid'] : 0;
+        $dest = isset($_GET['dest']) ? $_GET['dest'] : '/?p=' . $postId;
+        header('Location: ' . $dest, true, 302);
+        exit;
+    }
+}
+
+require_once $wp_load;
+
+// Get request parameters
+$searchId = isset($_GET['sid']) ? (int) $_GET['sid'] : 0;
+$postId = isset($_GET['pid']) ? (int) $_GET['pid'] : 0;
+$position = isset($_GET['pos']) ? (int) $_GET['pos'] : 0;
+$page = isset($_GET['page']) ? (int) $_GET['page'] : 1;
+$dest = isset($_GET['dest']) ? $_GET['dest'] : '';
+
+// Load plugin classes first (needed for DB access)
+$plugin_dir = dirname(__FILE__, 2);
+require_once $plugin_dir . '/includes/class-db-connection.php';
+require_once $plugin_dir . '/includes/class-analytics.php';
+
+try {
+    // Get database connection
+    $db = ROI_APU_Search_DB::get_instance();
+    $pdo = $db->get_pdo();
+    $prefix = $db->get_prefix();
+
+    // Build destination URL if empty
+    if (empty($dest)) {
+        // Obtain site_url from database (not HTTP_HOST)
+        $stmt = $pdo->prepare(
+            "SELECT option_value FROM {$prefix}options
+             WHERE option_name = 'home' LIMIT 1"
+        );
+        $stmt->execute();
+        $home = $stmt->fetch(PDO::FETCH_ASSOC);
+        $site_url = $home ? rtrim($home['option_value'], '/') : '';
+
+        // Try to get post_name for proper permalink
+        $stmt = $pdo->prepare(
+            "SELECT post_name FROM {$prefix}posts WHERE ID = ? LIMIT 1"
+        );
+        $stmt->execute([$postId]);
+        $post = $stmt->fetch(PDO::FETCH_ASSOC);
+
+        if ($post && !empty($post['post_name'])) {
+            $dest = $site_url . '/' . $post['post_name'] . '/';
+        } else {
+            $dest = $site_url . '/?p=' . $postId;
+        }
+    }
+
+    // Get analytics config
+    $cfg = ROI_APU_Search_Analytics::get_config();
+
+    // Log click
+    ROI_APU_Search_Analytics::logClick(
+        $pdo,
+        $prefix,
+        $cfg,
+        $searchId,
+        $postId,
+        max(1, $position),
+        max(1, $page),
+        $dest
+    );
+} catch (\Throwable $e) {
+    error_log('ROI APU Search Click Error: ' . $e->getMessage());
+    // Never break redirect due to tracking
+    // Fallback dest if error occurred before setting it
+    if (empty($dest)) {
+        $dest = '/?p=' . $postId;
+    }
+}
+
+// Redirect to destination
+header('Location: ' . $dest, true, 302);
+exit;