修复长文本 embedding 超限，并固定请求分片策略 - #27

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830, actions/checkout@11d5960a326750d5838078e36cf38b85af677262, astral-sh/setup-uv@d0cc045d04ccac9d8b7881df0226f9e82c39688e, azure/setup-helm@1a275c3b69536ee54be43f2070a358922e12c8d4, docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8, docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/