修复 Docker 镜像缺少 arm64 架构

[suyiiyii]

Summary

• 为 release/main/manual-build 的 Docker 推送补充 linux/amd64,linux/arm64 多架构构建
• 生成 multi-arch manifest 以解决 ARM64 拉取失败

Test plan

• uv run pytest（本地失败：tests/platforms/test_weibo.py::test_rsshub_compare；tests/test_proxy.py::test_without_proxy）

Made with Cursor

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This change is 

fixed #757

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.09%. Comparing base (83022c0) to head (b7e433a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #757   +/-   ##
=======================================
  Coverage   85.09%   85.09%           
=======================================
  Files          99       99           
  Lines        5634     5634           
=======================================
  Hits         4794     4794           
  Misses        840      840           

Flag	Coverage Δ
smoke-test	85.09% <ø> (ø)

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