Summary

This PR ports a small fork-maintained patch set onto current main to restore two Feishu UX/runtime behaviors and one Control UI visibility improvement:

1. restore Feishu group-name and topic/thread label display
2. restore Feishu direct-message sender-name fallback
3. split Control UI context notices between model context ceiling and higher-rate pricing threshold

What changed

Feishu

• preserve Feishu group display names instead of normalizing them into slug-like labels
• append the chat id only when it is not already visible in the label
• resolve topic labels from the root message and surface them in thread context labels
• use chatMembers for DM peer-name fallback
• prefer user_id before open_id when resolving group sender names

Control UI

• add gateway.controlUi.chat.showPricingThreshold
• split the chat context notice into:
  • model context usage / limit
  • higher-rate pricing threshold
• wire the setting through gateway/bootstrap/UI layers
• add the corresponding tests

Validation

Local validation on the upstream-port branch:

• passed: src/gateway/control-ui.http.test.ts
• passed: pnpm ui:build
• passed: newly added Feishu coverage for DM member-name fallback and group sender user_id fallback
• note: 3 ACP-routing tests in extensions/feishu/src/bot.test.ts also fail when re-run locally on current origin/main, so they are not introduced by this PR branch
• note: browser UI tests were not re-run in this temporary worktree because the local environment currently lacks @vitest/browser-playwright

Scope

This PR only carries the functional patch set. It does not include any deploy/update automation or local runtime-management changes.