feat: satellite page transponder/activity filters as virtual types

The satellite selection screen's 'Select satellite type' dialog now lists
three virtual types first (AMSAT Live FM, AMSAT Live Linear, Live SSTV)
before the TLE-source types. Selecting one filters the satellite list to
that transponder/activity set; multiple selections union. 'All' is kept.

- SelectionRepo.getTypesList: virtual types prepended (All preserved)
- SelectionRepo.resolveTypeIds: FM/Linear -> AMSAT catnum sets,
  Live SSTV -> mode=SSTV radios; other types via persisted IDs
- Tests: virtual-type filtering, union, clear, list-order assertion

feature/satellites/src/main/java/com/rtbishop/look4sat/feature/satellites/SatellitesScreen.kt

@@ -177,6 +177,7 @@ private fun SatellitesScreen(
                 )
             }
         }
+        // 转发器/活动筛选已在"卫星类型"对话框前三个选项中体现(AMSAT Live FM/Linear, Live SSTV).
         ElevatedCard(modifier = Modifier.fillMaxSize()) {
             val emptyMessage = stringResource(R.string.sat_empty_list_message)
             when {