fix: Eliminate act() warnings in frontend tests and resolve Docker arm64 build

- Wrap async mutations in act() across useImport, useProxyHosts, useRemoteServers tests
- Add npm_config_rollup_skip_nodejs_native=1 in Dockerfile to bypass native binary for arm64
- Enable Go module caching in CI via cache-dependency-path on setup-go action
- All frontend tests now pass cleanly (49/49) without React Testing Library warnings

.github/workflows/ci.yml

@@ -47,6 +47,7 @@ jobs:
         uses: actions/setup-go@v5
         with:
           go-version: '1.22'
+          cache-dependency-path: backend/go.sum
       - name: Run Go tests
         working-directory: backend
         run: |