fix(test): fix 17 pre-existing unit test failures and add astrolabe CI build

Unit test fixes:
- test_userinfo_routes: patch nextcloud_httpx_client instead of httpx.AsyncClient
- test_instrument_tool: patch trace_operation in metrics module (where imported)
- test_management_app_password_endpoints: patch nextcloud_httpx_client and
  get_settings at correct import locations
- test_management_status_endpoint: patch detect_auth_mode and get_settings at
  correct import locations (api.management, not config/config_validators)
- test_token_exchange: fix TokenBrokerService constructor args (client_id/
  client_secret instead of encryption_key)

CI:
- Add Node.js setup and astrolabe build step (composer + npm ci + npm run build)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/test.yml

@@ -72,6 +72,18 @@ jobs:
           cd third_party/oidc
           composer install --no-dev
 
+      - name: Set up Node.js
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version: 22
+
+      - name: Build Astrolabe app
+        run: |
+          cd third_party/astrolabe
+          composer install --no-dev --optimize-autoloader
+          npm ci
+          npm run build
+
       # Start services with the appropriate profile
       - name: Run docker compose
         uses: hoverkraft-tech/compose-action@4894d2492015c1774ee5a13a95b1072093087ec3 # v2.5.0