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/paths/limits.yaml

@@ -0,0 +1,48 @@
+get:
+  summary: Get service limits
+  x-auth-scopes: [read_manifest]
+  responses:
+    '200':
+      description: Limits
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/limits-policy.yaml'
+          examples:
+            medium:
+              value:
+                tier: medium
+                limits:
+                  upload_max_artifact_size_bytes_soft: 1073741824
+                  upload_max_artifact_size_bytes_hard: 2147483648
+                  read_max_requests_per_minute_soft: 300
+                  read_max_requests_per_minute_hard: 600
+                  upload_max_requests_per_minute_soft: 6
+                  upload_max_requests_per_minute_hard: 12
+                  report_max_requests_per_minute_soft: 120
+                  report_max_requests_per_minute_hard: 240
+                  burst_requests_per_minute: 1200
+    '401':
+      description: Unauthorized
+      x-error-codes: [unauthorized]
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/error.yaml'
+          examples:
+            unauthorized:
+              value:
+                code: unauthorized
+                message: Missing or invalid token
+    '429':
+      description: Too Many Requests
+      x-error-codes: [rate_limited]
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/error.yaml'
+          examples:
+            rate_limited:
+              value:
+                code: rate_limited
+                message: Too many requests