Complete private authentication, server integrations and activity reporting

Add Fabric/Forge version builds and Paper integration, preserve permanent player identities across renames, harden session authorization, and surface privacy-conscious launcher/server activity in the panel.

integrations/settings.gradle

@@ -0,0 +1,16 @@
+pluginManagement {
+    repositories {
+        maven { url = 'https://maven.fabricmc.net/' }
+        maven { url = 'https://maven.minecraftforge.net/' }
+        gradlePluginPortal()
+    }
+}
+rootProject.name = 'scopenet-integrations'
+include 'common', 'paper'
+// Build loaders separately: Forge and Loom use different Gradle generations.
+if (providers.gradleProperty('loader').orNull == 'fabric') include 'fabric'
+if (providers.gradleProperty('loader').orNull == 'forge') include 'forge'
+if (providers.gradleProperty('mcVersion').getOrElse('').startsWith('26.')) {
+    if (findProject(':fabric') != null) project(':fabric').buildFileName = 'modern.gradle'
+    if (findProject(':forge') != null) project(':forge').buildFileName = 'modern.gradle'
+}