refactor: retire standalone map/stats/dailies/stories sub-pages

Phase 1 of the standalone sub-page cleanup. The trip page consolidated
these views (inline map + filter bar + inline stats), leaving the
standalone pages unreachable and the last consumers of the old map
code path (feed-map inline script + map.html renderGpxJourney variant).

- Delete templates: map, stats, dailies, stories + feed-map partial
- Delete 02.map/03.stats page folders across all trips
- Keep 01.dailies/04.stories as inert data containers (routable:false)
- Fix demo source + Makefile demo-load so reload stays consistent
- Drop dead map-page body class in base.html.twig

Site converges on MapUtils.initEntryMap(); child entries/stories remain
reachable (verified: keepers 200, retired 404, no Twig errors).

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

pages/01.trips/italy-2025/04.stories/stories.md

@@ -1,5 +1,7 @@
 ---
 title: Stories
-template: stories
+template: default
+routable: false
+visible: false
 published: true
 ---