refactor(§7.5): rinomina Setup-* Install-CIToolchain-* (WinBuild2025/2022/Linux2404)

- template/Setup-WinBuild2025.ps1  Install-CIToolchain-WinBuild2025.ps1
- template/Setup-WinBuild2022.ps1  Install-CIToolchain-WinBuild2022.ps1
- template/Setup-LinuxBuild2404.sh  Install-CIToolchain-Linux2404.sh

Aggiornati tutti i riferimenti in: Prepare-WinBuild2025/2022, Prepare-LinuxBuild2404,
Deploy-WinBuild2025/2022/LinuxBuild2404, Validate-DeployState, Validate-SetupState,
README.md, TODO.md, docs/WINDOWS-TEMPLATE-SETUP.md, docs/LINUX-TEMPLATE-SETUP.md,
docs/TEST-PLAN-v1.3-to-HEAD.md, gitea/actions/local-ci-build/action.yml.

§7 chiuso (5/5 done).

gitea/actions/local-ci-build/action.yml

@@ -1,4 +1,4 @@
-# .gitea/actions/local-ci-build/action.yml
+# .gitea/actions/local-ci-build/action.yml
 #
 # Reusable composite action — Local CI/CD System
 #
@@ -63,7 +63,7 @@ inputs:
     description: >
       Set to "true" to clone the repository inside the VM rather than
       transferring a zip from the host. Requires Git in the template (see
-      Setup-WinBuild2025.ps1 Step 12 / Setup-LinuxBuild2404.sh).
+      Install-CIToolchain-WinBuild2025.ps1 Step 12 / Install-CIToolchain-Linux2404.sh).
       Preferred for repositories larger than ~200 MB.
     required: false
     default: 'false'
@@ -243,3 +243,4 @@ runs:
         path: ${{ steps.invoke-ci.outputs.artifact-path }}\*.log
         retention-days: 3
         if-no-files-found: ignore
+