fix: redact passwords from credential strings

domain/src/main/kotlin/com/flagship/abox/manager/domain/Models.kt

@@ -13,7 +13,9 @@ value class DeviceName(val value: String)
 value class Username(val value: String)
 
 @JvmInline
-value class Password(val value: String)
+value class Password(val value: String) {
+    override fun toString(): String = "Password(***)"
+}
 
 enum class ProviderType {
     ABOX,

domain/src/test/kotlin/com/flagship/abox/manager/domain/DomainResultTest.kt

@@ -1,6 +1,7 @@
 package com.flagship.abox.manager.domain
 
 import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
 import org.junit.Assert.assertTrue
 import org.junit.Test
 
@@ -20,4 +21,15 @@ class DomainResultTest {
         assertTrue(result is DomainResult.Failure)
         assertEquals("20504", (result as DomainResult.Failure).error.externalCode)
     }
+
+    @Test
+    fun credentialStringsDoNotExposePassword() {
+        val plaintext = "secret-password"
+        val password = Password(plaintext)
+        val credentials = LoginCredentials(Username("demo"), password)
+
+        assertFalse(password.toString().contains(plaintext))
+        assertFalse(credentials.toString().contains(plaintext))
+        assertTrue(credentials.toString().contains("Password(***)"))
+    }
 }