Add 80/20 random split (replaces cross-area 46/54 split)

- scripts/make_split.py: merges cross-area train+test (33,708 pairs),
  shuffles with seed=42, splits 80/20
- meta/train_80.json (26,966) + meta/test_20.json (6,742)
- After seg filter: 24,891 train / 6,252 test
- Default paths in train_gtauav.py updated to use new split

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

CLAUDE.md

@@ -158,8 +158,10 @@ Meta-файл `meta/seg_filter.json`: исключение изображени
   - Drone: RandomResizedCrop(0.7-1.0), HFlip, Rotation(15°), ColorJitter, Grayscale(5%), GaussianBlur
   - Satellite: RandomResizedCrop(0.7-1.0), HFlip, ColorJitter, Grayscale(5%)
   - Eval: Resize+CenterCrop (clean, no augmentation)
-- Train: 15,693 pairs → 13,622 after seg filter (cross-area)
-- Test: 18,015 pairs
+- **Split:** 80/20 random из всех 33,708 пар (`meta/train_80.json` / `meta/test_20.json`)
+- Train: 26,966 → 24,891 after seg filter
+- Test: 6,742 → 6,252 after seg filter
+- Скрипт: `python -m scripts.make_split --ratio 0.8 --seed 42`
 
 ### V2 (UAV-GeoLoc, gin)
 | Конфиг | Gate init | Описание |