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/artifact.yaml

@@ -0,0 +1,58 @@
+get:
+  summary: Download artifact
+  x-auth-scopes: [read_manifest]
+  parameters:
+    - name: project_id
+      in: path
+      required: true
+      schema:
+        type: string
+    - name: version
+      in: path
+      required: true
+      schema:
+        type: string
+  responses:
+    '200':
+      description: Artifact tar.gz
+      content:
+        application/gzip:
+          schema:
+            type: string
+            format: binary
+    '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
+    '404':
+      description: Not Found
+      x-error-codes: [not_found]
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/error.yaml'
+          examples:
+            not_found:
+              value:
+                code: not_found
+                message: Artifact not found
+    '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