feat: TTLock page redesign — sector circles, COM dropdown, DLL diagnostics

- SectorPicker: circles 1–16, click to toggle (blue=selected, gray=not)
- COM port: dropdown populated from agent's serial ports list + refresh button
- Per-workstation buttons: HardDriveDownload (save), Zap (test encoder)
- Workstations without COM port shown as dimmed with amber 'Энкодер не настроен'
- DLL entry point error shown with hint to check TTHotel libs/index.js
- Backend: GET /ttlock/dll-info?workstation_id= → reads TTHotel index.js via agent
- api.ts: added dllInfo() call

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

src/lib/api.ts

@@ -616,6 +616,9 @@ export const api = {
     testEncoder: (slug: string, workstationId: string) =>
       req<{ ok: boolean }>('POST', `/api/hotels/${slug}/ttlock/test`, { workstationId }),
 
+    dllInfo: (slug: string, workstationId: string) =>
+      req<{ ok: boolean; content: string; path: string }>('GET', `/api/hotels/${slug}/ttlock/dll-info?workstation_id=${workstationId}`),
+
     getRoomLocks: (slug: string) =>
       req<RoomLockMapping[]>('GET', `/api/hotels/${slug}/ttlock/room-locks`),