fix: install_failure type mismatch — issue never reached GitHub

SetupActivity was sending type 'install-failure' (hyphen) but the PHP
version-guard bypass list only checked for 'install_failure' (underscore).
Result: if the kiosk was not on the latest released version the error was
silently discarded and no GitHub issue was created.

Fix:
- SetupActivity: change type to 'install_failure' (underscore, consistent
  with KioskActivity which already used the correct name)
- api/index.php: add 'install-failure' (hyphen) to the bypass list as
  defensive fallback so old APK builds already in the field are covered too

evershelf-kiosk/app/src/main/kotlin/it/dadaloop/evershelf/kiosk/SetupActivity.kt

@@ -868,7 +868,7 @@ class SetupActivity : AppCompatActivity() {
                                 val msg = intent?.getStringExtra(android.content.pm.PackageInstaller.EXTRA_STATUS_MESSAGE) ?: "status=$status"
                                 setGatewayUI("❌", getString(R.string.install_error_install), msg, 0xFFf87171.toInt())
                                 ErrorReporter.reportMessage(
-                                    "install-failure",
+                                    "install_failure",
                                     "PackageInstaller failed: status=$status msg=$msg",
                                     mapOf("pkg" to targetPkg, "status" to status, "msg" to msg)
                                 )