feat: module toggles in POS config and Instance Manager

- Add GET/PUT /pos/api/config/modules endpoints in POS config_bp.py
- Update sidebar.js to filter nav items based on enabled modules
- Add Modules section to POS config.html with toggles for WhatsApp, Marketplace, MercadoLibre
- Add module load/save logic to POS config.js
- Preload modules in app-init.js for sidebar caching

- Add tenant module management to Instance Manager
  - get_tenant_modules / update_tenant_modules in tenant_service.py
  - GET/PUT /api/tenants/<id>/modules endpoints in tenants_bp.py
  - Add modules modal to manager index.html
  - Add module editing UI and logic to manager.js
  - Add toggle-switch CSS to manager.css

pos/services/wa_quotation.py

@@ -105,7 +105,7 @@ def confirm_quotation(tenant_conn, phone):
     cur.execute("UPDATE quotations SET status = 'converted' WHERE id = %s", (qid,))
     tenant_conn.commit()
     cur.close()
-    clear_last_shown(phone)
+    clear_last_shown(tenant_conn, phone)
     return qid
 
 
@@ -342,7 +342,7 @@ def clear_quotation(tenant_conn, phone):
         cur.execute("UPDATE quotations SET status = 'cancelled' WHERE id = %s", (qid,))
         tenant_conn.commit()
         cur.close()
-    clear_last_shown(phone)
+    clear_last_shown(tenant_conn, phone)
     return qid