Windy API returns 400 at ~1050 offset globally regardless of bounding
box size. The quadrant-splitting on 400 caused infinite recursion since
every sub-region hit the same limit.
On 400: keep cameras already fetched, stop paginating. The 10K cap
split is retained with MAX_SPLIT_DEPTH=3 to prevent runaway recursion.
- Rename `const seedMeta` to `seedMetaVal` to avoid shadowing the
`seedMeta()` function, which caused "Cannot access before initialization"
- Auto-split into quadrants when Windy API returns 400 (offset limit ~1000),
instead of only splitting at the 10K safety cap
