ci: replace review + architect-review with multi-review

[Svtter]

Summary

• Add multi-review.yml workflow — runs 4 parallel reviewers (quality, security, performance, architecture) with coordinator synthesis, posting 1 consolidated comment
• Remove review.yml and architect-review.yml — redundant with multi-review
• Add multi-review smoke test steps to ci.yml and smoke-test.yml

Test plan

• CI smoke test passes (multi-review action loads without error)
• Multi-review workflow runs on this PR and posts a coordinator-synthesized comment
• feature-missing.yml still runs independently (not covered by multi-review)

🤖 Generated with Claude Code

[github-actions]

发现遗漏

经过分析，PR 存在以下功能遗漏：

MEDIUM

architect-review.yml 没有按 PR 描述删除，而是重命名为了 multi-review.yml
PR body 写的是 "Remove review.yml and architect-review.yml" — redundant with multi-review"，但实现方式是将 architect-review.ymlrename 为multi-review.yml而非删除后新建。虽然最终效果上旧的 architect-review workflow 不再存在，但 git 层面这不是"删除"而是"重命名"，与 PR 描述不完全一致。应删除architect-review.yml并创建全新的multi-review.yml`，或在 PR 描述中明确说明是 rename。

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