chore: release v0.24.2 (#96)

## Summary

Add CHANGELOG entry for v0.24.2.

## Changes in v0.24.2

### Fixed

- `calendar.CalendarEventsResponse`: expose `NextDate` cursor so callers
can follow pagination (`/v1/quote/finance_calendar` returns results
across multiple pages via `next_date`)
- `calendar.CalendarEventInfo.Symbol`: convert raw `counter_id` (e.g.
`ST/US/CRM`) to standard symbol format (`CRM.US`)
- `quote.DailyOptionVolume.Symbol`: convert `underlying_counter_id` to
symbol format

### Changed

- Add `internal/counter.IDToSymbol` as shared `counter_id` → symbol
conversion helper; `sharelist` migrated to use it

## Related

- #95

feat(http): enable connection reuse and set idle timeout to 60s (#94)

## Summary
- Remove `req.Close = true` that was forcing a new TCP connection per
request
- Configure a custom `http.Transport` with `IdleConnTimeout` of 60
seconds
- Enables Go's default connection pooling for better performance

## Test plan
- [x] `go build ./...` passes
- [ ] Verify connection reuse via server-side access logs or `netstat`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 <[email protected]>

fix lost buy_power field (#78)

upgrade changelog (#85)

Co-authored-by: 袁章洪 <[email protected]>

chore: migrate CN endpoints to longbridge.cn, update token storage pa…

…th, add changelog for v0.21.0 and v0.22.0

release v0.21.0

Release v0.20.0: OAuth2, Longbridge migration, config/docs updates

fix: candle stick trade session is different to trade session in prot… (

#77)

bug fix: candle stick trade session is different to trade session in
prot…

support get over night trade session kline (#76)

Support get over night trade session kline

fix: should set accept-language by config.Language (#74)

Add accept-language when do http request