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>

assets/.htaccess

@@ -0,0 +1,11 @@
+# Aggressive caching for static assets. Cache-busting is done via a ?v=<mtime>
+# query string appended by includes/header.php whenever the file changes.
+
+<IfModule mod_headers.c>
+    <FilesMatch "\.(css|js|svg|png|jpe?g|webp|gif|ico|woff2?|ttf|otf|eot|map)$">
+        Header set Cache-Control "public, max-age=31536000, immutable"
+    </FilesMatch>
+</IfModule>
+
+# Make sure no directory listing is exposed even if a stray index file is missing.
+Options -Indexes