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/status.yaml

@@ -0,0 +1,84 @@
+post:
+  summary: Report update status
+  x-auth-scopes: [report_status]
+  parameters:
+    - name: project_id
+      in: path
+      required: true
+      schema:
+        type: string
+  requestBody:
+    required: true
+    content:
+      application/json:
+        schema:
+          $ref: '../schemas/status-report.yaml'
+        examples:
+          success:
+            value:
+              project_id: demo
+              version: 1.2.3
+              status: success
+              timestamp: 2025-12-28T10:15:30Z
+              client_id: device-42
+              duration_ms: 2450
+          failure:
+            value:
+              project_id: demo
+              version: 1.2.3
+              status: failed
+              timestamp: 2025-12-28T10:15:30Z
+              client_id: device-42
+              reason: checksum_mismatch
+              error_code: checksum_mismatch
+  responses:
+    '202':
+      description: Accepted
+    '400':
+      description: Bad Request
+      x-error-codes: [invalid_payload]
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/error.yaml'
+          examples:
+            invalid_payload:
+              value:
+                code: invalid_payload
+                message: Missing required fields
+    '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
+    '422':
+      description: Unprocessable Entity (invalid version or status)
+      x-error-codes: [version_invalid, status_invalid]
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/error.yaml'
+          examples:
+            version_invalid:
+              value:
+                code: version_invalid
+                message: Version does not match SemVer
+    '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