AB#423 Add mikkeli zones

middleware/config/mikkeli_zone_areas_20260122.json

@@ -0,0 +1,14 @@
+{
+"type": "FeatureCollection",
+"name": "mikkeli_zone_areas_20260122",
+"xy_coordinate_resolution": 1e-06,
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+]
+}

middleware/zones.js

@@ -14,6 +14,7 @@ function setup(prefix) {
     Joensuu: require('./config/joensuu_zone_areas_20250402.json'),
     Vaasa: require('./config/vaasa_zone_lines_20231220.json'),
     Kotka: require('./config/kotka_zone_areas_20250114.json'),
+    Mikkeli: require('./config/mikkeli_zone_areas_20260122.json')
   };
 
   // precompute bounding boxes to optimize test speed