Fix range of bldgh in Pydantic model

[dayantur]

This PR addresses a bug in the range constraint for bldgh in site.py.

Main changes

• bldgh Pydantic Field set to be ge=0 in site.py

[github-actions]

🔍 Schema Preview Deployed

Preview URLs:

• 🆕 Preview schemas: https://umep-dev.github.io/SUEWS/preview/pr-705/schemas/suews-config/
• 📋 Preview landing: https://umep-dev.github.io/SUEWS/preview/pr-705/

Production URLs (unchanged):

• ✅ Production schemas: https://umep-dev.github.io/SUEWS/schemas/suews-config/
• 🏠 Production landing: https://umep-dev.github.io/SUEWS/

---

⚠️ Important: Preview schemas are in a subdirectory and do not affect production. The preview pages include warning banners to prevent accidental use in production configs.

[sunt05]

No – the counter issue relates to the grid ID, not the building height constraint. The user's concern, for example, is that the 5 in sites.5 should match the grid ID, not the internal Python counter (which starts from 0).

[suegrimmond]

Note Grid ID - can be very different from numerical order -

[dayantur]

@sunt05 @suegrimmond sorry for the mistake - I will open a different PR for that issue :) and edit the description of this PR