feat: add Next Overhaul Date to master data initialization

src/dashboard_model/service.py

@@ -37,6 +37,7 @@ async def get_master_data_list(db_session: DbSession):
     # Ensure Current EAF exists
     await _get_or_create_master_data(db_session, "Current EAF Realization", 85.62)
     await _get_or_create_master_data(db_session, "Last Overhaul Date", 0)
+    await _get_or_create_master_data(db_session, "Next Overhaul Date", 0)
     query = select(RBDMasterData)
     result = await db_session.execute(query)
     return result.scalars().all()