fix: add microphone foreground service type for AssistantService STT

Android 14+ requires explicit foregroundServiceType declaration for
microphone access in foreground services. Without it, SpeechRecognizer
silently fails on the second turn of the voice loop.

Also centralizes Android SDK versions (compileSdk, minSdk, targetSdk)
into libs.versions.toml and bumps minSdk from 28 to 29.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

android/app/build.gradle.kts

@@ -15,12 +15,12 @@ val keystoreProperties = Properties().apply {
 
 android {
     namespace = "io.picoclaw.android"
-    compileSdk = 36
+    compileSdk = libs.versions.android.compileSdk.get().toInt()
 
     defaultConfig {
         applicationId = "io.picoclaw.android"
-        minSdk = 28
-        targetSdk = 36
+        minSdk = libs.versions.android.minSdk.get().toInt()
+        targetSdk = libs.versions.android.targetSdk.get().toInt()
         versionCode = 1
         versionName = "1.0.0"
     }

android/app/src/main/AndroidManifest.xml

@@ -7,6 +7,7 @@
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MICROPHONE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
 
     <queries>
@@ -66,7 +67,7 @@
         <service
             android:name=".assistant.AssistantService"
             android:exported="false"
-            android:foregroundServiceType="specialUse">
+            android:foregroundServiceType="microphone|specialUse">
             <property
                 android:name="android.app.PROPERTY_SPECIAL_USE_FGS_SUBTYPE"
                 android:value="AI voice assistant overlay for real-time conversation" />

android/app/src/main/java/io/picoclaw/android/assistant/AssistantService.kt

@@ -2,6 +2,7 @@ package io.picoclaw.android.assistant
 
 import android.app.Notification
 import android.content.Intent
+import android.content.pm.ServiceInfo
 import android.graphics.PixelFormat
 import android.os.IBinder
 import android.view.Gravity
@@ -87,7 +88,12 @@ class AssistantService : LifecycleService(), SavedStateRegistryOwner {
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
         super.onStartCommand(intent, flags, startId)
 
-        startForeground(NOTIFICATION_ID, buildNotification())
+        startForeground(
+            NOTIFICATION_ID,
+            buildNotification(),
+            ServiceInfo.FOREGROUND_SERVICE_TYPE_MICROPHONE
+                or ServiceInfo.FOREGROUND_SERVICE_TYPE_SPECIAL_USE
+        )
 
         // Resolve wsUrl from the main WebSocketClient
         val mainWsClient: WebSocketClient by inject()

android/core/data/build.gradle.kts

@@ -6,10 +6,10 @@ plugins {
 
 android {
     namespace = "io.picoclaw.android.core.data"
-    compileSdk = 36
+    compileSdk = libs.versions.android.compileSdk.get().toInt()
 
     defaultConfig {
-        minSdk = 28
+        minSdk = libs.versions.android.minSdk.get().toInt()
     }
 
     compileOptions {

android/core/domain/build.gradle.kts

@@ -4,10 +4,10 @@ plugins {
 
 android {
     namespace = "io.picoclaw.android.core.domain"
-    compileSdk = 36
+    compileSdk = libs.versions.android.compileSdk.get().toInt()
 
     defaultConfig {
-        minSdk = 28
+        minSdk = libs.versions.android.minSdk.get().toInt()
     }
 
     compileOptions {

android/core/ui/build.gradle.kts

@@ -5,10 +5,10 @@ plugins {
 
 android {
     namespace = "io.picoclaw.android.core.ui"
-    compileSdk = 36
+    compileSdk = libs.versions.android.compileSdk.get().toInt()
 
     defaultConfig {
-        minSdk = 28
+        minSdk = libs.versions.android.minSdk.get().toInt()
     }
 
     buildFeatures {

android/feature/chat/build.gradle.kts

@@ -5,10 +5,10 @@ plugins {
 
 android {
     namespace = "io.picoclaw.android.feature.chat"
-    compileSdk = 36
+    compileSdk = libs.versions.android.compileSdk.get().toInt()
 
     defaultConfig {
-        minSdk = 28
+        minSdk = libs.versions.android.minSdk.get().toInt()
     }
 
     buildFeatures {

android/gradle/libs.versions.toml

@@ -1,4 +1,7 @@
 [versions]
+android-compileSdk = "36"
+android-minSdk = "29"
+android-targetSdk = "36"
 agp = "9.0.1"
 kotlin = "2.3.0"
 ksp = "2.3.6"