Add host document providers for file failure tests

tools/chatgui-android/router-tests/src/main/kotlin/android/content/Context.kt

@@ -9,6 +9,7 @@ import android.hardware.SensorManager
 import android.telephony.SubscriptionManager
 import android.telephony.TelephonyManager
 import com.utun.chat.data.HostConfigProvider
+import java.io.File
 
 /** Только host-тест: управляемые Android managers, без устройств/разрешений ОС. */
 class Context {
@@ -17,6 +18,8 @@ class Context {
         const val POWER_SERVICE = "power"
     }
     val packageName = "com.utun.chat"
+    var cacheDir = File(System.getProperty("java.io.tmpdir"), "utun-router-host-cache")
+    val contentResolver = ContentResolver()
     var vibrator: Vibrator? = Vibrator()
     var powerManager: PowerManager? = PowerManager()
     var notificationManager: NotificationManager? = NotificationManager()

tools/chatgui-android/router-tests/src/main/kotlin/android/content/HostDocuments.kt

@@ -0,0 +1,24 @@
+package android.content
+
+import android.net.Uri
+import java.io.ByteArrayInputStream
+import java.io.ByteArrayOutputStream
+import java.io.InputStream
+import java.io.OutputStream
+
+/** Управляемые URI без Android provider; ошибки чтения/записи задаёт конкретный тест. */
+class ContentResolver {
+    var displayName = "document.bin"
+    var input: (Uri) -> InputStream? = { ByteArrayInputStream(byteArrayOf(1, 2, 3)) }
+    var output: (Uri) -> OutputStream? = { ByteArrayOutputStream() }
+    var delete: (Uri) -> Boolean = { true }
+    fun query(uri: Uri, projection: Array<String>, selection: String?, args: Array<String>?, order: String?) = Cursor(displayName)
+    fun openInputStream(uri: Uri) = input(uri)
+    fun openOutputStream(uri: Uri, mode: String) = output(uri)
+}
+
+class Cursor(private val name: String) : AutoCloseable {
+    fun moveToFirst() = true
+    fun getString(column: Int) = name
+    override fun close() {}
+}

tools/chatgui-android/router-tests/src/main/kotlin/android/provider/HostDocuments.kt

@@ -0,0 +1,7 @@
+package android.provider
+
+import android.content.ContentResolver
+import android.net.Uri
+
+object OpenableColumns { const val DISPLAY_NAME = "_display_name" }
+object DocumentsContract { fun deleteDocument(resolver: ContentResolver, uri: Uri) = resolver.delete(uri) }