fix(kiosk): target SDK 35 + setInstallReason for Android 16 compatibility

- compileSdk/targetSdk 34 → 35 (Android 15 stable)
- versionCode 17 → 18, versionName 1.7.16 → 1.7.17
- PackageInstaller.SessionParams: add setInstallReason(INSTALL_REASON_USER)
  on API 26+ — required on Android 14+ to avoid STATUS_FAILURE=1 on self-update
- DownloadManager failure: report dm_status + dm_reason in error payload
  so future issues include the HTTP error code (e.g. 404 vs network error)

Fixes #91 #92

evershelf-kiosk/app/build.gradle.kts

@@ -5,14 +5,14 @@ plugins {
 
 android {
     namespace = "it.dadaloop.evershelf.kiosk"
-    compileSdk = 34
+    compileSdk = 35
 
     defaultConfig {
         applicationId = "it.dadaloop.evershelf.kiosk"
         minSdk = 24
-        targetSdk = 34
-        versionCode = 17
-        versionName = "1.7.16"
+        targetSdk = 35
+        versionCode = 18
+        versionName = "1.7.17"
     }
 
     signingConfigs {