Incorrect street name "Windthorststr." for postalCode 33142 (Büren) — should be "Windhorststr."

[caipi-germany]

## Description

The `/de/Streets` endpoint returns an incorrect street name for postal code **33142** (Büren, Nordrhein-Westfalen).

**API response:**
`GET /de/Streets?postalCode=33142&name=Windt`
→ returns `"name": "Windthorststr."`

**Expected:**
The correct street name is **"Windhorststr."** (without the "t" before "horst").

## Evidence

- **Deutsche Post / PostDirekt PLZ-Server** (https://www.postdirekt.de/plzserver/) lists the street as **"Windhorststr."** for PLZ 33142, Büren.
- **DHL Parcel DE Shipping API v2** rejects shipments to "Windthorststr." in 33142 Büren with:
  `validationMessage: "The street entered could not be found."`

## Steps to reproduce

curl "https://openplzapi.org/de/Streets?postalCode=33142&name=Wind"

Look for the entry with `"name": "Windthorststr."` — this should be `"Windhorststr."`.

## Additional context

Discovered while building an automated address validation workflow that cross-references openplzapi.org with the DHL shipping API. The DHL API consistently rejects the spelling found in openplzapi.org for this street.

[fstueber]

This is how it is defined in OpenStreetMap: https://www.openstreetmap.org/way/28288145