readme: fix broken KAIST dataset links

[WoosikLee2510]

The Google Drive links for the converted KAIST rosbags/ground truths are dead (the UD Google Workspace storage policy change removed the shared drive). This replaces the per-file Drive table with two mirrors of the full set (urban18-urban39 bags + GT):

• Hugging Face: https://huggingface.co/datasets/gladiator7737/kaist-urban-dataset
• UD Robots NAS

Fixes #50, #52.

[github-actions]

Simulation regression report - master vs PR

8 seeds/config, sim UD_Warehouse, informational only (does not block merge).
Delta is PR relative to master (mean). Lower is better for RMSE / Time; NEES closer to ~1-3 is well-calibrated.

full

Metric	master	PR	Delta (mean)
RMSE ori (deg)	133.911 +/- 0.261	133.828 +/- 0.041	-0.1%
RMSE pos (m)	0.087 +/- 0.012	0.081 +/- 0.012	-6.9%
NEES ori	2797298.000 +/- 61393.700	2799522.300 +/- 72345.300	+0.1%
NEES pos	7.200 +/- 1.500	6.500 +/- 1.800	-9.7%
Time (s)	40.300 +/- 0.600	40.300 +/- 0.500	+0.0%

stereo_gps

Metric	master	PR	Delta (mean)
RMSE ori (deg)	0.158 +/- 0.033	0.158 +/- 0.033	+0.0%
RMSE pos (m)	0.076 +/- 0.012	0.076 +/- 0.012	+0.0%
NEES ori	4.400 +/- 2.100	4.400 +/- 2.100	+0.0%
NEES pos	3.800 +/- 1.200	3.800 +/- 1.200	+0.0%
Time (s)	18.800 +/- 0.500	18.500 +/- 0.300	-1.6%

stereo_lidar

Metric	master	PR	Delta (mean)
RMSE ori (deg)	0.366 +/- 0.084	0.388 +/- 0.090	+6.0%
RMSE pos (m)	0.156 +/- 0.028	0.156 +/- 0.029	+0.0%
NEES ori	12.000 +/- 5.400	14.400 +/- 7.100	+20.0%
NEES pos	51.100 +/- 34.800	56.200 +/- 30.400	+10.0%
Time (s)	42.400 +/- 0.400	42.400 +/- 0.300	+0.0%

stereo_wheel

Metric	master	PR	Delta (mean)
RMSE ori (deg)	133.843 +/- 0.057	133.843 +/- 0.057	+0.0%
RMSE pos (m)	0.085 +/- 0.028	0.085 +/- 0.028	+0.0%
NEES ori	2035390.700 +/- 42925.400	2035390.700 +/- 42925.400	+0.0%
NEES pos	28.200 +/- 38.400	28.200 +/- 38.400	+0.0%
Time (s)	20.800 +/- 0.200	20.700 +/- 0.200	-0.5%

vio_stereo

Metric	master	PR	Delta (mean)
RMSE ori (deg)	0.174 +/- 0.036	0.174 +/- 0.036	+0.0%
RMSE pos (m)	0.111 +/- 0.032	0.111 +/- 0.032	+0.0%
NEES ori	2.000 +/- 0.900	2.000 +/- 0.900	+0.0%
NEES pos	12.600 +/- 16.500	12.600 +/- 16.500	+0.0%
Time (s)	18.000 +/- 0.200	17.800 +/- 0.100	-1.1%