refactor(kiosk): remove built-in scale, add SSL + gateway detection

- Remove BLE/scale code (BleScaleManager, ScaleProtocol, GatewayWebSocketServer, ScaleGatewayService)
- Kiosk is now a pure WebView wrapper — scale handled by standalone gateway app
- Fix SSL certificate error: accept self-signed certs for local servers (WebView + connection test)
- Add gateway APK detection: check if it.dadaloop.evershelf.scalegate is installed
- If gateway installed: show green status, auto-launch on finish
- If not installed: show download link to GitHub releases
- Remove BLE/foreground service permissions from manifest
- Remove java-websocket dependency
- Bump version to 1.1.0

evershelf-kiosk/app/build.gradle.kts

@@ -11,8 +11,8 @@ android {
         applicationId = "it.dadaloop.evershelf.kiosk"
         minSdk = 24
         targetSdk = 34
-        versionCode = 1
-        versionName = "1.0.0"
+        versionCode = 2
+        versionName = "1.1.0"
     }
 
     buildTypes {
@@ -41,8 +41,4 @@ dependencies {
     implementation("com.google.android.material:material:1.11.0")
     implementation("androidx.constraintlayout:constraintlayout:2.1.4")
     implementation("androidx.webkit:webkit:1.10.0")
-    // WebSocket server (for scale gateway)
-    implementation("org.java-websocket:Java-WebSocket:1.5.5")
-    // Coroutines
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3")
 }