docs: 补充第三方声明（MIT 合规）

- GridGeometry.kt 头部注明移植自 OrbitDeckiOS（Paul Stoetzer, N8HM, MIT）
- 新增 THIRD_PARTY_NOTICES.md：OrbitDeckiOS (MIT) + Material Design Icons (Apache-2.0)

core/domain/src/main/java/com/rtbishop/look4sat/core/domain/utility/GridGeometry.kt

@@ -14,6 +14,10 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * Contains code ported from OrbitDeckiOS (https://github.com/prstoetzer/OrbitDeckiOS),
+ * Copyright (c) 2025 Paul Stoetzer, N8HM, licensed under the MIT License.
+ * See THIRD_PARTY_NOTICES.md for the full MIT license text.
  */
 package com.rtbishop.look4sat.core.domain.utility