feat: implement update-service v1 migration and enrollment flow

- added /update/enroll endpoint and enrollment logic
- migrated update client to v1 api endpoints and bearer auth
- implemented remote status reporting in backend and scripts
- updated requirements and project status

docs/architecture/openapi/schemas/enrollment-token-create-request.yaml

@@ -0,0 +1,20 @@
+type: object
+required:
+  - project_id
+properties:
+  project_id:
+    type: string
+    example: demo
+  client_id:
+    type: string
+    nullable: true
+    example: device-42
+  software_id:
+    type: string
+    nullable: true
+    example: kiosk
+  expires_at:
+    type: string
+    format: date-time
+    nullable: true
+    example: 2026-12-30T10:00:00Z