- Add `start_sync_task()` in agent/sync.rs: spawns a background task
that syncs immediately on app startup, then every 10 minutes.
- `sync_once()` performs a single pass; errors are logged and swallowed
so the periodic task never stops.
- Remove authentication requirement from OpenRouter API (no API key needed).
- Call `service.start_sync_task()` from main.rs after AppService init.
- Also update the existing `sync_upstream_models` (HTTP API) to remove
the now-unnecessary API key requirement for consistency.
Add ssh_clone_url and https_clone_url to ProjectRepositoryItem,
constructed from config.ssh_domain() and config.git_http_domain().
Update frontend RepoInfo interface and header.tsx to use the
server-provided URLs instead of hardcoded values.
