Add server-side clustering for map with 30k+ properties

- Remove 1000 property limit from count display
- Add MLS_Cluster class for geohash-based server-side clustering
- Add AJAX endpoint for dynamic cluster loading based on viewport/zoom
- Update property-results.php and ajax-handlers.php to use efficient counting
- Update map JavaScript to fetch clusters dynamically as user pans/zooms
- Server returns clusters at low zoom, individual markers at high zoom
- Fixes property count showing 1000 instead of actual ~30k properties

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

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

wp-content/plugins/mls-by-hansonxyz/includes/class-mls-query.php

@@ -353,6 +353,31 @@ class MLS_Query {
             $values[] = $args['city'];
         }
 
+        if (!empty($args['county'])) {
+            $where[] = 'county = %s';
+            $values[] = $args['county'];
+        }
+
+        if (!empty($args['min_price'])) {
+            $where[] = 'list_price >= %d';
+            $values[] = (int) $args['min_price'];
+        }
+
+        if (!empty($args['max_price'])) {
+            $where[] = 'list_price <= %d';
+            $values[] = (int) $args['max_price'];
+        }
+
+        if (!empty($args['min_beds'])) {
+            $where[] = 'bedrooms_total >= %d';
+            $values[] = (int) $args['min_beds'];
+        }
+
+        if (!empty($args['min_baths'])) {
+            $where[] = 'bathrooms_total >= %d';
+            $values[] = (int) $args['min_baths'];
+        }
+
         $sql = "SELECT COUNT(*) FROM {$table} WHERE " . implode(' AND ', $where);
 
         if (!empty($values)) {