feat: self-host all JS/CSS (GDPR) + clicksports map tiles

- Leaflet, TopJSON, Chart.js, Mermaid served from /js/
- Leaflet CSS from /css/leaflet.min.css
- World atlas GeoJSON from /data/countries-110m.json
- Zero external CDN requests (GDPR compliant)
- Map tiles from maps.clicksports.de (fixed missing Noto Sans font)
- Attribution: clicksports maps + OpenMapTiles + OpenStreetMap
- window.load for script initialization (load order fix)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

layouts/shortcodes/world-map.html

@@ -1,7 +1,7 @@
 {{ $lang := .Page.Language.Lang }}
 {{ $countries := hugo.Data.countries }}
 
-<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/leaflet@1.9.4/dist/leaflet.min.css" />
+<link rel="stylesheet" href="{{ "css/leaflet.min.css" | relURL }}" />
 <style>
 .ifk-map-wrap { max-width: 100%; margin: 2rem 0; }
 .ifk-map-wrap h3 { text-align: center; margin-bottom: 0.5rem; font-size: 1.25rem; }
@@ -29,10 +29,10 @@
   </div>
 </div>
 
-<script src="https://cdn.jsdelivr.net/npm/leaflet@1.9.4/dist/leaflet.min.js"></script>
-<script src="https://cdn.jsdelivr.net/npm/topojson-client@3.1.0/dist/topojson-client.min.js"></script>
+<script src="{{ "js/leaflet.min.js" | relURL }}"></script>
+<script src="{{ "js/topojson-client.min.js" | relURL }}"></script>
 <script>
-document.addEventListener('DOMContentLoaded', function() {
+window.addEventListener('load', function() {
   var LANG = "{{ $lang }}";
   var STATUS_COLORS = { enforced: '#4d7c0f', passed: '#059669', progress: '#86efac', guidelines: '#d1fae5' };
   var STATUS_LABELS = {
@@ -50,12 +50,12 @@ document.addEventListener('DOMContentLoaded', function() {
     scrollWheelZoom: false, zoomControl: true
   });
 
-  L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {
-    attribution: '© <a href="https://openstreetmap.org/copyright">OpenStreetMap</a>',
+  L.tileLayer('https://maps.clicksports.de/styles/klokantech-basic/256/{z}/{x}/{y}.png', {
+    attribution: '&copy; <a href="https://maps.clicksports.de">clicksports maps</a> &copy; <a href="https://openmaptiles.org">OpenMapTiles</a> &copy; <a href="https://openstreetmap.org/copyright">OpenStreetMap</a>',
     maxZoom: 6
   }).addTo(map);
 
-  fetch('https://cdn.jsdelivr.net/npm/world-atlas@2.0.2/countries-110m.json')
+  fetch('{{ "data/countries-110m.json" | relURL }}')
     .then(function(r) { return r.json(); })
     .then(function(topo) {
       var geo = topojson.feature(topo, topo.objects.countries);