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/enroll-request.yaml

@@ -0,0 +1,20 @@
+type: object
+required:
+  - project_id
+  - client_id
+  - software_id
+  - enroll_token
+properties:
+  project_id:
+    type: string
+    example: demo
+  client_id:
+    type: string
+    example: device-42
+  software_id:
+    type: string
+    example: kiosk
+  enroll_token:
+    type: string
+    description: Pre-shared, single-use enrollment token
+    example: enroll_6f3d2c...