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>

site/includes/header_video.php

@@ -0,0 +1,38 @@
+<div class="clearfix"></div>
+<div class="video fade-in">
+  <div class="overlay"></div>
+  <video playsinline autoplay muted loop poster="<?= base_url($header_video_img) ?>">
+    <source src="<?= base_url($header_video_video) ?>" type="video/mp4">
+  </video>
+  <div class="container h-100">
+    <div class="d-flex h-100 text-center align-items-center">
+      <div class="w-100 text-white">
+        <h1 class="display-3"><img src="<?= base_url('site/assets/img/logos/logo_crossfit_white.svg')?>" alt="CrossFit" style="opacity: .85; max-width: 320px;"></h1>
+        <p class="lead mb-0"></p>
+      </div>
+    </div>
+  </div>
+</div>
+
+<style>
+.video {
+  position: relative; background-color: #000;
+  height: 75vh; min-height: 25rem; width: 100%;
+  overflow: hidden;
+}
+.video video {
+  position: absolute; top: 50%; left: 50%;
+  min-width: 100%; min-height: 100%;
+  width: auto; height: auto; z-index: 0;
+  transform: translate(-50%, -50%);
+  object-fit: cover;
+}
+.video .container { position: relative; z-index: 2; }
+/* Fallback poster for touch devices */
+@media (pointer: coarse) and (hover: none) {
+  .video {
+    background: url('<?= base_url($header_video_img) ?>') #000 center/cover no-repeat;
+  }
+  .video video { display: none; }
+}
+</style>