fix(client): use getAdminProperties in admin panel

- Add getAdminProperties() to api.js with admin endpoint
- Update admin.js loadProperties() to use getAdminProperties
- Returns full dataset with admin filtering support

Refs: production admin panel

public/js/admin.js

@@ -207,7 +207,7 @@ class AdminPanel {
   // ============ PROPERTIES ============
   async loadProperties() {
     try {
-      const res = await API.getProperties({ lang: this.lang, limit: 100 })
+      const res = await API.getAdminProperties({ status: 'active', limit: 100 })
       if (res.success) { this.properties = res.data; this.renderPropertiesGrid() }
     } catch (e) { console.error('Failed to load properties:', e) }
   }

public/js/api.js

@@ -261,6 +261,12 @@ class API {
     return response.json();
   }
 
+  static async getAdminProperties(filters = {}) {
+    const params = new URLSearchParams(filters).toString();
+    const response = await fetch(`${API_BASE}/admin/properties${params ? '?' + params : ''}`, { credentials: 'include' });
+    return response.json();
+  }
+
   static async getAdminStats() {
     const response = await fetch(`${API_BASE}/admin/stats`, { credentials: 'include' });
     return response.json();