Add Fire OS voice command permission for MediaSession (#2076)

## Description
Just a small change to AndroidManifest.xml so that Alexa voice commands
work in Wholphin.

"To enable voice command and control to work with your application, add
the permission com.amazon.permission.media.session.voicecommandcontrol
to your application manifest"
See
https://developer.amazon.com/docs/fire-tv/mediasession-api-integration.html

This is required only for Fire OS <14.

### Related issues
I couldn't find any related issues.

Steps to reproduce: Start some media -> Tell Alexa to pause/play
("Alexa, pause", "Alexa, play")
Expected behavior: Media pauses/resumes almost immediately.
Actual behavior: Pausing takes ~10 seconds, resuming doesn't work at all
Environment: 
- FireTV Cube Gen 3 running Fire OS 7.7.1.7 (PS7717/5741)
- Wholphin 1.0.9-0-g2d87d526
- Jellyfin server 12.2

### Testing
See environment above.
After the change pause/play works immediately.

## Screenshots
N/A

## AI or LLM usage
I used Claude to analyze the issue and Claude Code to build a debug app
for testing.

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Damontecres <damontecres@gmail.com>

app/src/appstore/AndroidManifest.xml

@@ -3,5 +3,8 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" tools:node="remove" />
+    <uses-permission
+        android:name="com.amazon.permission.media.session.voicecommandcontrol"
+        tools:node="remove" />
 
 </manifest>

app/src/firetv/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" tools:node="remove" />
+
+</manifest>

app/src/main/AndroidManifest.xml

@@ -15,6 +15,7 @@
         android:name="android.permission.READ_EXTERNAL_STORAGE"
         android:maxSdkVersion="28" />
     <uses-permission android:name="com.android.providers.tv.permission.WRITE_EPG_DATA" />
+    <uses-permission android:name="com.amazon.permission.media.session.voicecommandcontrol" />
 
     <uses-feature
         android:name="android.hardware.touchscreen"