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/paper/build.gradle

@@ -1,8 +1,17 @@
-repositories { maven { url = 'https://hub.spigotmc.org/nexus/content/repositories/snapshots/' } }
+repositories {
+    maven { url = 'https://hub.spigotmc.org/nexus/content/repositories/snapshots/' }
+    maven { url = 'https://repo.extendedclip.com/content/repositories/placeholderapi/' }
+    maven { url = 'https://jitpack.io' }
+}
 dependencies {
     implementation project(':common')
+    implementation project(':api')
     implementation 'com.google.code.gson:gson:2.10.1'
     compileOnly 'org.spigotmc:spigot-api:1.20.1-R0.1-SNAPSHOT'
+    // Optional integrations: the plugin detects these at runtime and works without them.
+    compileOnly 'net.luckperms:api:5.4'
+    compileOnly 'me.clip:placeholderapi:2.11.6'
+    compileOnly('com.github.MilkBowl:VaultAPI:1.7.1') { exclude group: 'org.bukkit' }
 }
 processResources {
     inputs.property 'version', project.version
@@ -12,6 +21,7 @@ jar {
     archiveBaseName = 'scopenet-paper'
     duplicatesStrategy = DuplicatesStrategy.EXCLUDE
     from project(':common').sourceSets.main.output
+    from project(':api').sourceSets.main.output
     from { configurations.runtimeClasspath.findAll { it.name.endsWith('.jar') && !it.name.startsWith('common-') }.collect { zipTree(it) } }
     exclude 'META-INF/*.SF', 'META-INF/*.RSA', 'META-INF/*.DSA'
 }