feat: Equipment page — KKT hides connection, Windows printer, COM retry; agent update banner

- EquipmentPage: KKT hides USB/COM/Network buttons (DTO handles connection)
- EquipmentPage: Printer adds Windows connection type — lists installed printers from agent
- EquipmentPage: COM port section has retry button (↺)
- api.ts: add listPrinters, extend connection type
- workstations.ts: add /printers endpoint (list_printers command)

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

src/lib/api.ts

@@ -359,6 +359,8 @@ export const api = {
       req<{ ok: true; sent: number }>('POST', `/api/hotels/${slug}/workstations/update-all`),
     listPorts: (slug: string, wsId: string) =>
       req<{ ports: { port: string; description?: string }[] }>('GET', `/api/hotels/${slug}/workstations/${wsId}/ports`),
+    listPrinters: (slug: string, wsId: string) =>
+      req<{ printers: { name: string; isDefault: boolean }[] }>('GET', `/api/hotels/${slug}/workstations/${wsId}/printers`),
   },
 
   // ── Agents ────────────────────────────────────────────────────────────────
@@ -1001,7 +1003,7 @@ export interface WorkstationDevice {
   workstationId: string
   type: 'kkt' | 'printer' | 'netup'
   name: string
-  connection: 'usb' | 'network' | 'com'
+  connection: 'usb' | 'network' | 'com' | 'windows'
   networkHost?: string
   networkPort?: number
   comPort?: string