chore: 更新 backend 子仓库指针到 agent 约定提交

同步根仓库中的 backend 子仓库引用，纳入 backend 协作说明与本地状态忽略规则，保持主仓与子仓版本一致。 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-17 10:49:40 +08:00 · 2026-03-17 10:49:40 +08:00 · e6d7a0bd9f
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