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

backend/models.py

@@ -41,6 +41,16 @@ class UpdateStatus(BaseModel):
     last_status: str
     last_error: Optional[str] = None
     last_timestamp: Optional[str] = None
+    enrolled: bool = False
+
+
+class EnrollRequest(BaseModel):
+    enroll_token: Optional[str] = None
+
+
+class EnrollResponse(BaseModel):
+    enrolled: bool
+    message: str
 
 
 class UpdateCheckResponse(BaseModel):