Merge branch 'main' into feat/voice-geometry

Picks up #1308 (Overpass admission), #114 (Sea Marks and Ski Pistes),
#1206 (radio country coverage) and #1435. Resolutions:
- SECURITY.md: main's rewritten cross-site paragraph, with voice place
  search listed beside /api/overpass among the keyless map routes.
- scripts/format-scope.json: both sides. A merge on main dropped 97 entries
  (being restored there); keeping them, this PR's 12 and main's 2 new ones
  keeps every file in format:check. All 1,222 paths exist.
- Translation catalogs: main's two new keys and this PR's 47, no overlap.
- Layer count 36 (33 + OSM Places + Sea Marks + Ski Pistes); both schema
  pins re-derived, the first-run length is exactly 30,919 + 292 + 107.

.env.example

@@ -296,3 +296,8 @@ OVERPASS_UPSTREAMS=
 # frame-ancestors sources such as "https://example.com", or * for any page.
 # Unset, no page may frame it. Other pages of the app can never be framed.
 # GEV_EMBED_FRAME_ANCESTORS=
+
+# Optional keyless Radio Browser coverage: up to 8 ISO alpha-2 countries.
+# Each reserves up to 40 stations within the existing 750-station directory.
+# Restart after changing. Leave blank for the existing global selection.
+# RADIO_PRIORITY_COUNTRIES=IN,PL