Establish secure account and managed AI backend

Provide the production foundation for Apple identity, immutable credits, referrals, integrity checks, managed providers, and hardened Docker deployment.

settings.gradle.kts

@@ -0,0 +1,10 @@
+rootProject.name = "OSGAccountServer"
+
+dependencyResolutionManagement {
+    repositories {
+        mavenCentral()
+    }
+}
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version "1.0.0"
+}