Rename phy-z-srv-gpu01 to phy-srv-gpu01; fix share analysis scripts

- rename host/group/folder everywhere to match the server's actual
  hostname and physical label
- share-analysis.ps1: sanitize the output filename prefix — '-Paths "D:"'
  produced 'D:-file-types.csv' and Export-Csv failed with 'path format
  not supported', so no CSVs were written
- share-analysis.ps1: new -FolderDepth so folders can be aggregated at
  D:\Abteilungen\<Share> level, which matches the share layout
- list-shares.ps1: -WithSize walks local paths instead of UNC when run on
  the server itself (UNC was orders of magnitude slower and looked stuck)
  and prints progress every 50k files

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

ansible/roles/nvidia_gpu/tasks/main.yml

@@ -1,5 +1,5 @@
 ---
-# Automates server/phy-z-srv-gpu01/manuals/20260714-nvidia-driver-install.md
+# Automates server/phy-srv-gpu01/manuals/20260714-nvidia-driver-install.md
 # Requires Docker (geerlingguy.docker) for the container toolkit part.
 
 - name: Check Secure Boot state