refactor: remove CDN tags from feed-map, map, story templates

- feed-map.html.twig: removed MapLibre/toGeoJSON/maplibre-utils CDN tags; added {% do assets.addCss/addJs %} calls directly in partial
- map.html.twig: removed MapLibre/toGeoJSON/maplibre-utils CDN tags; added {% block map_assets %} with Asset Manager registrations
- story.html.twig: removed Scrollama CDN tag (now bundled in main.js as window.scrollama)

All map init and script logic remains unchanged. CDN requests eliminated.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr

themes/intotheeast/templates/story.html.twig

@@ -69,7 +69,6 @@
 
 <button class="story-totop" id="story-totop" aria-label="Back to top">↑ Top</button>
 
-<script src="https://cdn.jsdelivr.net/npm/scrollama@3/build/scrollama.min.js"></script>
 <script>
 /* ── Hero scroll effect ──────────────────────────────────── */
 (function () {