Kartenfeature: Geoparsing + Leaflet-Karte im Dashboard

- Neues Geoparsing-Modul (spaCy NER + geonamescache/Nominatim)
- article_locations-Tabelle mit Migration
- Pipeline-Integration nach Artikel-Speicherung
- API-Endpunkt GET /incidents/{id}/locations
- Leaflet.js + MarkerCluster im Dashboard-Grid
- Theme-aware Kartenkacheln (CartoDB dark / OSM light)
- Gold-Akzent MarkerCluster, Popup mit Artikelliste

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/static/js/api.js

@@ -102,6 +102,10 @@ const API = {
         return this._request('GET', `/incidents/${incidentId}/snapshots`);
     },
 
+    getLocations(incidentId) {
+        return this._request('GET', `/incidents/${incidentId}/locations`);
+    },
+
     refreshIncident(id) {
         return this._request('POST', `/incidents/${id}/refresh`);
     },