Add geotagging and location map v0.4

.env.example

@@ -9,3 +9,13 @@ APP_PORT=8080
 APP_NAME=Photo Date Editor
 MAX_UPLOAD_MB=150
 LOG_LEVEL=INFO
+
+# Optional map/geocoder overrides. Existing .env files may omit these.
+MAP_TILE_URL=https://tile.openstreetmap.org/{z}/{x}/{y}.png
+MAP_ATTRIBUTION=© OpenStreetMap contributors
+DEFAULT_MAP_LAT=64.5
+DEFAULT_MAP_LON=11.0
+DEFAULT_MAP_ZOOM=5
+GEOCODER_URL=https://nominatim.openstreetmap.org/search
+# Optional custom identification sent to the geocoder. The default uses APP_NAME, version and APP_URL.
+# GEOCODER_USER_AGENT=MorkPhotoDateEditor/0.4 (+https://edit.mork.fyi)