feat(settings): custom URL now overrides the online-update default source

The "Custom URL" dialog's two URL fields now control the default
source used by the online update, per the user's intent (one-time
setup, no extra steps per update):

- Defaults are real URLs now: TLE = Celestrak "All" (active group
  CSV), transceivers = SatNOGS API. The example.com placeholders are
  gone.
- updateFromRemote(): the "All" TLE entry and the "SatNOGS" entry are
  replaced by the user's URLs when the corresponding custom toggle is
  ON and the URL is non-blank; otherwise the real defaults are used.
  The old "Other" appended-source logic is removed - the toggle now
  means "use my URL for this source" instead of "download an extra
  source". Each source (TLE / transceivers) is independent.
- Each URL field gained a reset (loop) icon button on the right that
  restores the default URL text (new ic_reset drawable, Autorenew
  vector). Strings added in en/zh/tr.

Test updated: custom TLE URL data now lands under the "All" type
instead of "Other". Verified: core:data tests pass, settings + app
compile. Version stays 4.4.8 (覆盖 per user).

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/DatabaseRepo.kt

@@ -69,11 +69,14 @@ class DatabaseRepo(
         val dataSourcesSettings = settingsRepo.dataSourcesSettings.value
         val tleUrls = buildMap {
             putAll(Sources.satelliteDataUrls)
-            if (dataSourcesSettings.useCustomTLE) put(customSourceType, dataSourcesSettings.tleUrl)
+            // 开关开且 URL 非空 -> All 用自定义 URL;否则用默认 URL(在线更新默认源)
+            put("All", if (dataSourcesSettings.useCustomTLE && dataSourcesSettings.tleUrl.isNotBlank())
+                dataSourcesSettings.tleUrl else Sources.defaultTleUrl)
         }.filterValues { it.isNotBlank() }
         val radioUrls = buildMap {
             putAll(Sources.transceiversDataUrls)
-            if (dataSourcesSettings.useCustomTransceivers) put(customSourceType, dataSourcesSettings.transceiversUrl)
+            put("SatNOGS", if (dataSourcesSettings.useCustomTransceivers && dataSourcesSettings.transceiversUrl.isNotBlank())
+                dataSourcesSettings.transceiversUrl else Sources.defaultTransceiversUrl)
         }.filterValues { it.isNotBlank() }
         // launch all network requests concurrently
         val tleJobs = tleUrls.values.map { url -> async { url to remoteSource.getNetworkStream(url) } }

core/data/src/main/java/com/rtbishop/look4sat/core/data/repository/SettingsRepo.kt

@@ -29,6 +29,7 @@ import com.rtbishop.look4sat.core.domain.model.OtherSettings
 import com.rtbishop.look4sat.core.domain.model.PassesSettings
 import com.rtbishop.look4sat.core.domain.model.RCSettings
 import com.rtbishop.look4sat.core.domain.model.RadioControlSettings
+import com.rtbishop.look4sat.core.domain.source.Sources
 import com.rtbishop.look4sat.core.domain.predict.GeoPos
 import com.rtbishop.look4sat.core.domain.repository.ISettingsRepo
 import com.rtbishop.look4sat.core.domain.utility.positionToQth
@@ -393,8 +394,8 @@ class SettingsRepo(
     private fun getDataSourcesSettings(): DataSourcesSettings = DataSourcesSettings(
         useCustomTLE = preferences.getBoolean(keyUseCustomTle, false),
         useCustomTransceivers = preferences.getBoolean(keyUseCustomTransceivers, false),
-        tleUrl = preferences.getString(keyTleUrl, "https://example.com/tle.txt") ?: "",
-        transceiversUrl = preferences.getString(keyTransceiversUrl, "https://example.com/radio.json") ?: ""
+        tleUrl = preferences.getString(keyTleUrl, Sources.defaultTleUrl) ?: "",
+        transceiversUrl = preferences.getString(keyTransceiversUrl, Sources.defaultTransceiversUrl) ?: ""
     )
     //endregion