feat: allow editing NGO/organization name, like volunteer and opportunity names

[nadavosa]

Problem

Volunteer names and opportunity names/titles can be edited after creation, but the NGO/organization name cannot. There's no way to correct or update an NGO's name once it's set.

Ask

Add the ability to edit the NGO's name from the Einrichtungs-/Projektprofil page, consistent with how volunteer names and opportunity titles are already editable.

Notes

Should follow the same UX pattern used for renaming a volunteer or an opportunity (inline edit / edit action next to the name).