Add SCOPENET developer API and plugin compatibility layer (LuckPerms, PlaceholderAPI, Vault, CoreProtect, WorldGuard, Spark)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DjMbLQujBHunCCu5GpsHaT

integrations/settings.gradle

@@ -6,7 +6,7 @@ pluginManagement {
     }
 }
 rootProject.name = 'scopenet-integrations'
-include 'common', 'paper'
+include 'common', 'api', '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'