StemRoller: desktop stem separator, Android stems player, and server daemons

- stemroller/: PySide6/QML desktop app and player for separating music into stems
- android/: Plex music player that plays per-stem mixes, with Android Auto support,
  a graphic + parametric (Equalizer APO-style) EQ, and offline downloads
- server/: stemserve (serves stems to the app) and stemd (separates the library on
  the server's GPU, with "Stem Now" priority requests)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android/app/build.gradle.kts

@@ -0,0 +1,71 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.kotlin.compose)
+    alias(libs.plugins.kotlin.serialization)
+}
+
+android {
+    namespace = "com.stemroller.mobile"
+    compileSdk = 36
+
+    defaultConfig {
+        applicationId = "com.stemroller.mobile"
+        minSdk = 33
+        targetSdk = 36
+        versionCode = 1
+        versionName = "1.0"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            isShrinkResources = true
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+            // Personal sideload build: sign with the debug key so it installs without a keystore.
+            signingConfig = signingConfigs.getByName("debug")
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+    buildFeatures {
+        compose = true
+    }
+    packaging {
+        resources.excludes += "/META-INF/{AL2.0,LGPL2.1}"
+    }
+}
+
+kotlin {
+    compilerOptions {
+        jvmTarget.set(JvmTarget.JVM_17)
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.activity.compose)
+    implementation(libs.androidx.lifecycle.runtime.compose)
+    implementation(libs.androidx.lifecycle.process)
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.androidx.compose.ui)
+    implementation(libs.androidx.compose.ui.graphics)
+    implementation(libs.androidx.compose.foundation)
+    implementation(libs.androidx.compose.animation)
+    implementation(libs.androidx.compose.ui.tooling.preview)
+    debugImplementation(libs.androidx.compose.ui.tooling)
+    implementation(libs.androidx.media3.session)
+    implementation(libs.androidx.media3.common)
+    implementation(libs.androidx.palette)
+    implementation(libs.okhttp)
+    implementation(libs.coil.compose)
+    implementation(libs.coil.network.okhttp)
+    implementation(libs.kotlinx.serialization.json)
+    implementation(libs.kotlinx.coroutines.android)
+    implementation(libs.kotlinx.coroutines.guava)
+    testImplementation(libs.junit)
+}