feat: Page Editor Phase 1 - Core Infrastructure

- Add is_bot() detection in TemplateOverride.php (30+ bot patterns)
- Add PageSSR.php for server-side rendering of page sections
- Add PlaceholderRenderer.php for dynamic content resolution
- Add PagesController.php REST API for pages/templates CRUD
- Register PagesController routes in Routes.php

API Endpoints:
- GET /pages - list all pages/templates
- GET /pages/{slug} - get page structure
- POST /pages/{slug} - save page
- GET /templates/{cpt} - get CPT template
- POST /templates/{cpt} - save template
- GET /content/{type}/{slug} - get content with template applied

includes/Frontend/TemplateOverride.php

@@ -648,4 +648,100 @@ class TemplateOverride
 
         return $template;
     }
+    
+    /**
+     * Detect if current request is from a bot/crawler
+     * Used to serve SSR content for SEO instead of SPA redirect
+     * 
+     * @return bool True if request is from a known bot
+     */
+    public static function is_bot()
+    {
+        // Get User-Agent
+        $user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
+        if (empty($user_agent)) {
+            return false;
+        }
+        
+        // Convert to lowercase for case-insensitive matching
+        $user_agent = strtolower($user_agent);
+        
+        // Known bot patterns
+        $bot_patterns = [
+            // Search engine crawlers
+            'googlebot',
+            'bingbot',
+            'slurp',           // Yahoo
+            'duckduckbot',
+            'baiduspider',
+            'yandexbot',
+            'sogou',
+            'exabot',
+            
+            // Generic patterns
+            'crawler',
+            'spider',
+            'robot',
+            'scraper',
+            
+            // Social media bots (for link previews)
+            'facebookexternalhit',
+            'twitterbot',
+            'linkedinbot',
+            'whatsapp',
+            'slackbot',
+            'telegrambot',
+            'discordbot',
+            
+            // Other known bots
+            'applebot',
+            'semrushbot',
+            'ahrefsbot',
+            'mj12bot',
+            'dotbot',
+            'petalbot',
+            'bytespider',
+            
+            // Prerender services
+            'prerender',
+            'headlesschrome',
+        ];
+        
+        // Check if User-Agent contains any bot pattern
+        foreach ($bot_patterns as $pattern) {
+            if (strpos($user_agent, $pattern) !== false) {
+                return true;
+            }
+        }
+        
+        return false;
+    }
+    
+    /**
+     * Serve SSR content for bots
+     * Renders page structure as static HTML for search engine indexing
+     * 
+     * @param int $page_id Page ID to render
+     * @param string $type 'page' or 'template'
+     * @param array|null $post_data Post data for template rendering (CPT items)
+     */
+    public static function serve_ssr_content($page_id, $type = 'page', $post_data = null)
+    {
+        // Get page structure
+        if ($type === 'page') {
+            $structure = get_post_meta($page_id, '_wn_page_structure', true);
+        } else {
+            // CPT template
+            $structure = get_option("wn_template_{$type}", null);
+        }
+        
+        if (empty($structure) || empty($structure['sections'])) {
+            return false; // No structure, let normal WP handle it
+        }
+        
+        // Will be implemented in PageSSR class
+        // For now, return false to let normal WP handle
+        // TODO: Implement PageSSR::render($structure, $post_data)
+        return false;
+    }
 }