feat(console): add LLM routing UI (settings + chat selector)

[vvv214]

Description

Adds a Routing card under Settings > Models plus a routing-aware section in the Chat model selector.

This PR is console-only. It should be reviewed and merged after #3550, because it relies on the backend/runtime routing semantics introduced there:

• GET/PUT /config/agents/llm-routing?agent_id=...
• /models/active?scope=effective&agent_id=...
• scope-aware effective model resolution matching runtime behavior

Without #3550, the UI can render and round-trip config, but agent-scoped routing behavior will not be fully aligned at runtime.

Related Issue: Relates to #849

Security Considerations: No new auth surface. UI only; uses existing backend APIs.

Type of Change

• New feature
• Refactoring

Component(s) Affected

• Console (frontend web UI)
• Tests

Checklist

• If pre-commit auto-fixed files, I committed those changes and reran checks
• I ran relevant tests locally and they pass
• Documentation updated (if needed)
• Draft for review

Testing

• Settings → Models exposes global/agent routing controls.
• Chat model selector shows routing state and lets users switch between local/cloud paths.
• UI reads/writes:
  • GET/PUT /config/agents/llm-routing?agent_id=...
  • /models/active?scope=effective&agent_id=...

Local Verification Evidence

• pre-commit checks on touched frontend files passed previously on this branch.
• Manual verification completed against the current local backend:
  • Settings > Models routing card toggles and saves successfully
  • Chat routing trigger/badge updates and round-trips through backend
  • with current backend, cloud-routed and local-routed chats both return expected replies
  • official frontend still chats normally against the same current backend

Notes

• #3550 is a prerequisite backend/runtime PR.
• Rebased onto current main and conflict-resolved in console/src/pages/Chat/ModelSelector/index.tsx.
• Local npm run build on this machine currently hits an unrelated @ant-design/plots resolution error under src/pages/Settings/AgentStats/index.tsx; this does not come from the routing UI diff itself.

[github-actions]

Welcome to QwenPaw! 🐾

Hi @vvv214, this is your 7th Pull Request.

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  • Run and pass relevant tests (pytest or as applicable)
  • Update documentation if needed
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  # paste summary result
  
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