Dev: use build product flavors for app store release (#1205)

## Description
Instead of applying a code patch, this PR uses build time [product
flavors](https://developer.android.com/build/build-variants#product-flavors)
to define the existing default and an app store variant. This is more
robust than maintaining a patch file and making sure it is applied
before building.

The app store variant applies the same code changes (removing install
permission, requiring leanback, & setting `UpdateChecker.ACTIVE`), but
via manifest placeholders/merging and `BuildConfig` entries.

There are no user facing changes.

### Related issues
None

### Testing
Built the variants and verified manifest changes via aapt

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/AndroidManifest.xml

@@ -20,7 +20,7 @@
         android:required="false" />
     <uses-feature
         android:name="android.software.leanback"
-        android:required="false" />
+        android:required="${leanback}" />
     <uses-feature
         android:name="android.hardware.microphone"
         android:required="false" />

app/src/main/java/com/github/damontecres/wholphin/services/UpdateChecker.kt

@@ -65,7 +65,7 @@ class UpdateChecker
 
             private val NOTE_REGEX = Regex("<!-- app-note:(.+) -->")
 
-            val ACTIVE = true
+            const val ACTIVE = BuildConfig.UPDATING_ENABLED
         }
 
         /**

app/src/main/java/com/github/damontecres/wholphin/ui/detail/DebugPage.kt

@@ -54,6 +54,7 @@ import org.jellyfin.sdk.model.DeviceInfo
 import timber.log.Timber
 import java.io.BufferedReader
 import java.io.InputStreamReader
+import java.util.Date
 import javax.inject.Inject
 
 @HiltViewModel
@@ -75,6 +76,34 @@ class DebugViewModel
             display.supportedModes.orEmpty()
         }
 
+        val av1Included by lazy {
+            try {
+                Class.forName("androidx.media3.decoder.av1.Libdav1dVideoRenderer")
+                true
+            } catch (_: ClassNotFoundException) {
+                false
+            }
+        }
+
+        val ffmpegIncluded by lazy {
+            try {
+                Class.forName("androidx.media3.decoder.ffmpeg.FfmpegAudioRenderer")
+                true
+            } catch (_: ClassNotFoundException) {
+                false
+            }
+        }
+
+        val libMpvLoaded by lazy {
+            try {
+                System.loadLibrary("player")
+                System.loadLibrary("mpv")
+                true
+            } catch (_: Exception) {
+                false
+            }
+        }
+
         init {
             viewModelScope.launchIO {
                 serverRepository.currentUser.value?.rowId?.let {
@@ -218,6 +247,7 @@ fun DebugPage(
                     style = MaterialTheme.typography.displaySmall,
                     color = MaterialTheme.colorScheme.onSurface,
                 )
+                val buildTime = Date(BuildConfig.BUILD_TIME)
                 val pkgInfo = context.packageManager.getPackageInfo(context.packageName, 0)
                 val installInfo =
                     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
@@ -239,6 +269,11 @@ fun DebugPage(
                         "Version Code: ${pkgInfo.versionCodeLong}",
                         "ClientInfo:  ${viewModel.clientInfo}",
                         "Build type: ${BuildConfig.BUILD_TYPE}",
+                        "Build flavor: ${BuildConfig.FLAVOR}",
+                        "Build time: $buildTime",
+                        "FFMPEG included: ${viewModel.ffmpegIncluded}",
+                        "AV1 included: ${viewModel.av1Included}",
+                        "libmpv loaded: ${viewModel.libMpvLoaded}",
                         "Debug enabled: ${BuildConfig.DEBUG}",
                         "ABIs: ${Build.SUPPORTED_ABIS.toList()}",
                     ) + installInfo