feat(localagent): 统一消息反馈、回传与平台入站授权 - #1476

On November 2, 2026, GitHub will restrict `pull_request_target` on public repositories by default. To continue allowing the event trigger, configure an Actions policy. Learn more: https://gh.io/securely-using-pull_request_target#default-policy-for-pull_request_target

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683, actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

PR #1476 changes .github/workflows/**; GitHub Apps without workflows permission cannot enable auto-merge, so this PR remains manual-only.