refactor: extract LoginViewModel from LoginActivity

Move login logic (URL checking, authentication, client creation) into a
ViewModel with LiveData state and Channel-based events. Replace
temporary SSL setting variables with direct Settings writes and use a
ConstraintLayout Group for credential field visibility.

Author: jmattheis

app/build.gradle.kts

@@ -104,8 +104,3 @@ dependencies {
 
 }
 
-configurations {
-    configureEach {
-        exclude(group = "androidx.lifecycle", module = "lifecycle-viewmodel-ktx")
-    }
-}

app/src/main/kotlin/com/github/gotify/api/ClientFactory.kt

@@ -3,8 +3,8 @@ package com.github.gotify.api
 import com.github.gotify.SSLSettings
 import com.github.gotify.Settings
 import com.github.gotify.client.ApiClient
+import com.github.gotify.client.api.InfoApi
 import com.github.gotify.client.api.UserApi
-import com.github.gotify.client.api.VersionApi
 import com.github.gotify.client.auth.ApiKeyAuth
 import com.github.gotify.client.auth.HttpBasicAuth
 
@@ -37,12 +37,12 @@ internal object ClientFactory {
         return client
     }
 
-    fun versionApi(
+    fun infoApi(
         settings: Settings,
         sslSettings: SSLSettings = settings.sslSettings(),
         baseUrl: String = settings.url
-    ): VersionApi {
-        return unauthorized(settings, sslSettings, baseUrl).createService(VersionApi::class.java)
+    ): InfoApi {
+        return unauthorized(settings, sslSettings, baseUrl).createService(InfoApi::class.java)
     }
 
     fun userApiWithToken(settings: Settings): UserApi {

app/src/main/kotlin/com/github/gotify/init/InitializationActivity.kt

@@ -167,7 +167,7 @@ internal class InitializationActivity : AppCompatActivity() {
         callback: SuccessCallback<VersionInfo>,
         errorCallback: Callback.ErrorCallback
     ) {
-        ClientFactory.versionApi(settings)
+        ClientFactory.infoApi(settings)
             .version
             .enqueue(Callback.callInUI(this, callback, errorCallback))
     }