fix(map): DXCC 资产重建——俄罗斯拆欧/亚、提取子实体、英国四实体、德巴改现行码

- dxcc.json(176→189区): 沿乌拉尔山/河(OSM relation 21368163 + NE 乌拉尔河)
  把整只俄罗斯切成 European Russia(54)/Asiatic Russia(15)——修复亚洲俄罗斯
  永不填绿; 从父国环提取 Alaska/Hawaii/East Malaysia/French Guiana/Corsica/
  Crete/Sardinia/Kaliningrad/Franz Josef 9 子实体; 英国拆 England(223)/
  Scotland(279)/Wales(294)/N.Ireland(265) 四实体; Germany 81→230、
  Palestine 196→510 改为 ADIF 现行码(81/196 已删除, LoTW 导出现行码永不匹配)
- 新增 DxccAssetTest 5 例: 必备码齐全/ADIF名/环完整性/26城侧归属/禁用
  ADIF 3.1.7 全部62个已删除码; build.gradle 补 testImplementation org.json
- THIRD_PARTY_NOTICES: 补 OSM(ODbL) 与 Natural Earth(公共领域) 数据出处

THIRD_PARTY_NOTICES.md

@@ -44,3 +44,24 @@ SOFTWARE.
 - License: Apache-2.0
 - Used for: `core/presentation/src/main/res/drawable/ic_grid_finder.xml`
   (crosshairs-gps icon). Attribution is also noted in the icon file header.
+
+## OpenStreetMap (award boundary geometry)
+
+- Source: https://www.openstreetmap.org — relations `Ural Mountains` (21368163),
+  `England` (58447), `Scotland` (58446), `Wales` (58437),
+  `Northern Ireland` (156393)
+- License: Open Database License (ODbL) 1.0 —
+  https://opendatacommons.org/licenses/odbl/1-0/
+- Used for: the Europe/Asia split line of European/Asiatic Russia and the
+  England/Scotland/Wales/Northern Ireland partitions in
+  `feature/map/src/main/assets/awards/dxcc.json` (derived geometry).
+  Map tiles displayed in the app are © OpenStreetMap contributors and carry
+  their own in-app attribution.
+
+## Natural Earth
+
+- Source: https://www.naturalearthdata.com (1:110m countries, 1:10m rivers)
+- License: Public domain — https://www.naturalearthdata.com/about/terms-of-use/
+- Used for: the country/region polygons of the award boundary assets under
+  `feature/map/src/main/assets/awards/`, and the Ural river centerline used
+  for the European/Asiatic Russia split.