- Add parseRelativeTime function supporting "-3d", "-2h", "-30m" format
- Update parseTimeRangeParams to handle Unix timestamps and relative times
- Add unit tests with comprehensive coverage for all time formats
- Document v2 API in API.md with examples and migration guide
Enables intuitive time queries like from=-3d&to=-1h instead of
Unix timestamps, improving developer experience for the enhanced
v2 endpoint that supports 50k records vs legacy 10k limit.
