feat: KKT dto_device_id — multiple KKTs per DTO instance

- EquipmentPage: added "ID устройства в ДТО" field (config.dto_device_id),
  shown on device card as #1
- api.ts: typed config.dto_device_id in WorkstationDevice

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/api.ts

@@ -1006,7 +1006,7 @@ export interface WorkstationDevice {
   networkPort?: number
   comPort?: string
   purpose: 'fiscal' | 'kitchen' | 'bar' | 'receipt' | 'other'
-  config: Record<string, unknown>
+  config: Record<string, unknown> & { dto_user?: string; dto_pass?: string; dto_device_id?: string }
   fiscalMode?: boolean
   dtoPort?: number
 }