Add Falukant region and transport management features

- Implemented new endpoints in AdminController for managing Falukant regions, including fetching, updating, and deleting region distances.
- Enhanced the FalukantService with methods for retrieving region distances and handling upsert operations.
- Updated the router to expose new routes for region management and transport creation.
- Introduced a transport management interface in the frontend, allowing users to create and manage transports between branches.
- Added localization for new transport-related terms and improved the vehicle management interface to include transport options.
- Enhanced the database initialization logic to support new region and transport models.

backend/models/falukant/data/region_distance.js

@@ -0,0 +1,51 @@
+import { Model, DataTypes } from 'sequelize';
+import { sequelize } from '../../../utils/sequelize.js';
+import RegionData from './region.js';
+
+class RegionDistance extends Model {}
+
+RegionDistance.init(
+  {
+    sourceRegionId: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+      references: {
+        model: RegionData,
+        key: 'id',
+        schema: 'falukant_data',
+      },
+    },
+    targetRegionId: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+      references: {
+        model: RegionData,
+        key: 'id',
+        schema: 'falukant_data',
+      },
+    },
+    transportMode: {
+      // e.g. 'land', 'water', 'air' – should match VehicleType.transportMode
+      type: DataTypes.STRING,
+      allowNull: false,
+    },
+    distance: {
+      // distance between regions (e.g. in abstract units, used for travel time etc.)
+      type: DataTypes.DOUBLE,
+      allowNull: false,
+    },
+  },
+  {
+    sequelize,
+    modelName: 'RegionDistance',
+    tableName: 'region_distance',
+    schema: 'falukant_data',
+    timestamps: false,
+    underscored: true,
+  }
+);
+
+export default RegionDistance;
+
+
+