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.yaml

@@ -0,0 +1,39 @@
+type: object
+required:
+  - id
+  - project_id
+  - status
+  - created_at
+properties:
+  id:
+    type: string
+    example: tok_123
+  project_id:
+    type: string
+    example: demo
+  client_id:
+    type: string
+    nullable: true
+    example: device-42
+  software_id:
+    type: string
+    nullable: true
+    example: kiosk
+  status:
+    type: string
+    enum: [active, used, expired, revoked]
+    example: active
+  expires_at:
+    type: string
+    format: date-time
+    nullable: true
+    example: 2026-12-30T10:00:00Z
+  created_at:
+    type: string
+    format: date-time
+    example: 2025-12-30T10:00:00Z
+  used_at:
+    type: string
+    format: date-time
+    nullable: true
+    example: 2025-12-30T10:15:00Z