The original implementation had incorrect request/response shapes that
didn't match the Honcho v3 REST API (field naming, body structure),
an invalid default peer name, a bogus health check endpoint, and an
unnecessary observer peer.

- Use `id` instead of `name` in create requests, `configuration` instead of `config`
- Fix add-peers-to-session to send bare dict body per API spec
- Change default peer name from `user:default` to `user-default` (colon invalid)
- Remove health check (no /health endpoint; init() validates connectivity)
- Simplify to single peer (observer peer was unused)
- Attach peers inline at session creation time
- Use `{:#}` for full error chain in logs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Remove settings UI and config persistence to keep the first PR
focused on the core crate + CLI flags. The UI can be added in a
follow-up once the backend is validated.

Removed:
- honcho-section.tsx (new file, deleted)
- connections-section.tsx (reverted to upstream)
- use-settings.tsx (reverted to upstream)
- recording.rs (reverted to upstream)

This eliminates conflicts with open PRs screenpipe#2605 and screenpipe#2574 which
also modify recording.rs.

- Prevent zero-interval DoS when sync_interval_mins=0 (clamp to 1)
- Pass browser_url and focused fields through to synthesizer
- Rewrite synthesizer with improved formatting and privacy filtering

- Drop tests from client.rs and synthesizer.rs (follow-up)
- Inline session_manager.rs into service.rs (one fewer file)
- Simplify synthesizer to single flat format: timestamped lines
  showing app | window | url, instead of adaptive micro/summary modes
- Remove unused peer_chat and add_peers_to_session from client
- Remove focused field from RawEvent (unused)