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/admin-enrollment-tokens.yaml

@@ -0,0 +1,69 @@
+get:
+  summary: List enrollment tokens
+  x-auth-scopes: [admin]
+  parameters:
+    - name: project_id
+      in: query
+      required: false
+      schema:
+        type: string
+    - name: client_id
+      in: query
+      required: false
+      schema:
+        type: string
+    - name: status
+      in: query
+      required: false
+      schema:
+        type: string
+        enum: [active, used, expired, revoked]
+  responses:
+    '200':
+      description: Token list
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              items:
+                type: array
+                items:
+                  $ref: '../schemas/enrollment-token.yaml'
+    '401':
+      description: Unauthorized
+      x-error-codes: [unauthorized]
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/error.yaml'
+post:
+  summary: Create enrollment token
+  x-auth-scopes: [admin]
+  requestBody:
+    required: true
+    content:
+      application/json:
+        schema:
+          $ref: '../schemas/enrollment-token-create-request.yaml'
+  responses:
+    '201':
+      description: Created
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/enrollment-token-create-response.yaml'
+    '400':
+      description: Bad Request
+      x-error-codes: [invalid_payload]
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/error.yaml'
+    '401':
+      description: Unauthorized
+      x-error-codes: [unauthorized]
+      content:
+        application/json:
+          schema:
+            $ref: '../schemas/error.yaml'