Remove custom permission, fix client lifecycle and encrypted prefs

Remove USE_LCK_CONTROL permission from service to fix binding failures
caused by Android revoking custom permissions on app reinstall. Add
auto-cleanup of dead clients via RemoteCallbackList.onCallbackDied and
handle corrupted EncryptedSharedPreferences keyset gracefully. Lower
SDK minSdk to 32.

app/src/main/java/com/omixlab/lckcontrol/service/LckControlService.kt

@@ -57,7 +57,18 @@ class LckControlService : Service() {
 
     private val serviceScope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
     private val clientTracker = ClientTracker()
-    private val callbacks = RemoteCallbackList<ILckControlCallback>()
+    private val callbacks = object : RemoteCallbackList<ILckControlCallback>() {
+        override fun onCallbackDied(callback: ILckControlCallback, cookie: Any?) {
+            val uid = cookie as? Int ?: return
+            serviceScope.launch {
+                val removed = clientTracker.unregisterByUid(uid)
+                for (client in removed) {
+                    Log.d(TAG, "Auto-unregistered client ${client.clientId} (${client.packageName}) - process died")
+                    broadcastClientUnregistered(client.clientId)
+                }
+            }
+        }
+    }
 
     private val binder = object : ILckControlService.Stub() {
 
@@ -146,7 +157,8 @@ class LckControlService : Service() {
         // ── Clients ─────────────────────────────────────────
 
         override fun registerClient(clientName: String, packageName: String): String {
-            val clientId = clientTracker.register(clientName, packageName)
+            val uid = android.os.Binder.getCallingUid()
+            val clientId = clientTracker.register(clientName, packageName, uid)
             broadcastClientRegistered(clientId)
             return clientId
         }
@@ -174,7 +186,8 @@ class LckControlService : Service() {
         // ── Callbacks ───────────────────────────────────────
 
         override fun registerCallback(callback: ILckControlCallback) {
-            callbacks.register(callback)
+            val uid = android.os.Binder.getCallingUid()
+            callbacks.register(callback, uid)
         }
 
         override fun unregisterCallback(callback: ILckControlCallback) {