Why: R-platform spans core/ui/frontend/documents; also honors the
agreed housekeeping item — .env.dev must be gitignored (it holds live
API keys).
Evidence: make test full suite green on this head (exit 0); headless
walk on the real binary: avatar columns, settings shell with badges,
admin-row avatars, zero console errors.
Impact: capability layer only, no behavior changes. Merge order:
core -> ui -> frontend -> documents -> this PR.
Refs: proposal 2026-09-30-ui-redesign-and-auth.md (capability platform)
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Why
头像/卡片/设置页升级为系统基本能力(2026-09-30 用户裁定);附带 .gitignore 收尾(.env.dev 含真实密钥不得入库)。
改动
Evidence
make test EXIT=0;无头走查:消息头像列/设置外壳/管理头像,零控制台错误
Impact
能力层,无行为变更。