fix: Auto-update APK install via FileProvider + dynamic version

- Native ApkInstallerModule: FileProvider content:// URI for Android 7+
- REQUEST_INSTALL_PACKAGES permission in AndroidManifest
- file_paths.xml for FileProvider cache access
- APP_VERSION reads from package.json (not hardcoded)
- "Auf Updates pruefen" button in Settings
- Version display reads from package.json dynamically

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

android/android/app/src/main/java/com/ariacockpit/ApkInstallerModule.kt

@@ -0,0 +1,44 @@
+package com.ariacockpit
+
+import android.content.Intent
+import android.net.Uri
+import android.os.Build
+import androidx.core.content.FileProvider
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.bridge.ReactContextBaseJavaModule
+import com.facebook.react.bridge.ReactMethod
+import com.facebook.react.bridge.Promise
+import java.io.File
+
+class ApkInstallerModule(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext) {
+    override fun getName() = "ApkInstaller"
+
+    @ReactMethod
+    fun install(filePath: String, promise: Promise) {
+        try {
+            val file = File(filePath)
+            if (!file.exists()) {
+                promise.reject("FILE_NOT_FOUND", "APK nicht gefunden: $filePath")
+                return
+            }
+
+            val context = reactApplicationContext
+            val uri: Uri = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+                FileProvider.getUriForFile(context, "${context.packageName}.fileprovider", file)
+            } else {
+                Uri.fromFile(file)
+            }
+
+            val intent = Intent(Intent.ACTION_VIEW).apply {
+                setDataAndType(uri, "application/vnd.android.package-archive")
+                addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            }
+
+            context.startActivity(intent)
+            promise.resolve(true)
+        } catch (e: Exception) {
+            promise.reject("INSTALL_ERROR", e.message, e)
+        }
+    }
+}

android/android/app/src/main/java/com/ariacockpit/ApkInstallerPackage.kt

@@ -0,0 +1,16 @@
+package com.ariacockpit
+
+import com.facebook.react.ReactPackage
+import com.facebook.react.bridge.NativeModule
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.uimanager.ViewManager
+
+class ApkInstallerPackage : ReactPackage {
+    override fun createNativeModules(reactContext: ReactApplicationContext): List<NativeModule> {
+        return listOf(ApkInstallerModule(reactContext))
+    }
+
+    override fun createViewManagers(reactContext: ReactApplicationContext): List<ViewManager<*, *>> {
+        return emptyList()
+    }
+}

android/android/app/src/main/java/com/ariacockpit/MainApplication.kt

@@ -18,8 +18,7 @@ class MainApplication : Application(), ReactApplication {
       object : DefaultReactNativeHost(this) {
         override fun getPackages(): List<ReactPackage> =
             PackageList(this).packages.apply {
-              // Packages that cannot be autolinked yet can be added manually here, for example:
-              // add(MyReactNativePackage())
+              add(ApkInstallerPackage())
             }
 
         override fun getJSMainModuleName(): String = "index"