docs(skill): point users to the webui dashboard after curate

Guide the in-daemon curate agent to surface the ByteRover dashboard
(http://localhost:7700, Contexts page) once a topic is saved, so users
can actually see what was curated.

- SKILL.md: add `brv webui` to the Quick Reference and command list,
  noting the daemon already serves the dashboard on port 7700
- curate.md: on `data.status: "done"`, hand the user the clickable
  dashboard URL alongside `filePath`; add a "View What You Saved"
  section and a "Example Session Responses" walkthrough (kickoff →
  correction → completion JSON envelopes); add a Common Mistakes row
  for reporting a save without showing where to view it
- skill-connector tests: assert SKILL.md mentions `brv webui` and
  curate.md mentions `localhost:7700` + the new examples section