fix: transponder filters - mutual exclusion and beacon-free fallback

Two correctness fixes for the FM/Linear/SSTV filters:

1. Satellite type picker: virtual transponder types (AMSAT Live FM,
   AMSAT Live Linear, Live SSTV) are now mutually exclusive with the
   regular TLE-source types - ticking a virtual type clears Amateur/
   CubeSat/etc and vice versa, so selecting 'AMSAT Live FM' no longer
   unions in hundreds of non-transponder satellites. Virtual types
   still combine with each other. Also: an empty virtual-type resolve
   now yields an empty list instead of falling back to 'show all'.

2. Mutual-match fallback: when the AMSAT lists are empty (first run /
   sync failure) the DB mode filter used downlinkMode alone, so any
   downlink-only beacon sharing a mode label was misclassified
   (ISS/IO-86 CW beacons into Linear, FO-29's FM Digitalker into FM).
   New getIdsWithModesAndUplink() requires uplinkLow IS NOT NULL,
   matching real transponders only. SSTV filter keeps the old query
   (SSTV sats are often downlink-only).

Shared virtual-type names moved to Sources.virtualTypeNames.

feature/mutual/src/main/java/com/rtbishop/look4sat/feature/mutual/MutualViewModel.kt

@@ -307,11 +307,14 @@ class MutualViewModel(
             val amSatFm = settingsRepo.getAmSatFmCatnums()
             val amSatLinear = settingsRepo.getAmSatLinearCatnums()
             val filteredSatellites = if (amSatFm.isEmpty() && amSatLinear.isEmpty()) {
+                // 回退到数据库模式过滤: 只用带上行频率的转发器记录, 排除纯下行
+                // 信标/遥测(如 CW 信标、FM 语音合成信标), 避免 ISS/IO-86/FO-29 等
+                // 因共享模式标签(CW/FM)被误判进错误类别.
                 val filterModes = buildList {
                     if (state.filterFM) add("FM")
                     if (state.filterLinear) addAll(listOf("USB", "LSB", "CW", "SSB"))
                 }
-                val idsWithModes = satelliteRepo.getSatelliteIdsWithModes(filterModes)
+                val idsWithModes = satelliteRepo.getSatelliteIdsWithModesAndUplink(filterModes)
                 if (idsWithModes.isEmpty()) satellites
                 else satellites.filter { it.data.catnum in idsWithModes }
             } else {

feature/mutual/src/test/java/com/rtbishop/look4sat/feature/mutual/Fakes.kt

@@ -45,6 +45,7 @@ class FakeSatelliteRepo(
     override suspend fun getRadios(sat: OrbitalObject, pos: GeoPos, radios: List<SatRadio>, time: Long): List<SatRadio> = TODO()
     override suspend fun getRadiosWithId(id: Int): List<SatRadio> = TODO()
     override suspend fun getSatelliteIdsWithModes(modes: List<String>): List<Int> = emptyList()
+    override suspend fun getSatelliteIdsWithModesAndUplink(modes: List<String>): List<Int> = emptyList()
 }
 
 /**

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

@@ -42,6 +42,7 @@ import androidx.compose.ui.unit.dp
 import com.rtbishop.look4sat.core.presentation.MainTheme
 import com.rtbishop.look4sat.core.presentation.R
 import com.rtbishop.look4sat.core.presentation.SharedDialog
+import com.rtbishop.look4sat.core.domain.source.Sources
 
 @Preview(showBackground = true)
 @Composable
@@ -54,9 +55,20 @@ private fun MultiTypesDialogPreview() {
 internal fun MultiTypesDialog(
     allTypes: List<String>, types: List<String>, cancel: () -> Unit, accept: (List<String>) -> Unit
 ) {
+    // 虚拟类型(转发器/活动筛选)与普通 TLE 源类型互斥: 勾虚拟类型时取消普通类型,
+    // 勾普通类型时取消虚拟类型. 虚拟类型之间可多选组合.
+    val virtualTypes = Sources.virtualTypeNames
     val selected = remember { mutableStateOf(types.toSet()) }
     val toggle = { type: String ->
-        selected.value = if (type in selected.value) selected.value - type else selected.value + type
+        selected.value = if (type in selected.value) {
+            selected.value - type
+        } else if (type in virtualTypes) {
+            // 勾选虚拟类型: 移除所有普通类型, 保留已勾的虚拟类型.
+            (selected.value.filterTo(mutableSetOf()) { it in virtualTypes }) + type
+        } else {
+            // 勾选普通类型: 移除所有虚拟类型, 保留已勾的普通类型.
+            (selected.value.filterTo(mutableSetOf()) { it !in virtualTypes }) + type
+        }
     }
     val onAccept = { accept(selected.value.toList()) }
     SharedDialog(title = stringResource(R.string.sat_type_title), onCancel = cancel, onAccept = onAccept) {