Initial import of fitme3070.pt platform

Plain-PHP fleet platform with id.andmore.pt SSO. Wires shared/platform-tools
as a submodule (platform_update, backups, git/migration tools) like the other
platforms.

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

index.php

@@ -0,0 +1,4 @@
+<?php
+// Root entry — serves the public home page (the original site showed it at `/`
+// for everyone; the backoffice lives under views/ and is reached via links).
+require __DIR__ . '/site/index.php';