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/forge/build.gradle

@@ -0,0 +1,44 @@
+buildscript {
+    repositories {
+        maven { url = 'https://maven.minecraftforge.net/' }
+        mavenCentral()
+        gradlePluginPortal()
+    }
+    dependencies {
+        classpath 'net.minecraftforge.gradle:ForgeGradle:6.0.42'
+        classpath 'org.spongepowered:mixingradle:0.7.38'
+    }
+}
+apply plugin: 'net.minecraftforge.gradle'
+apply plugin: 'org.spongepowered.mixin'
+repositories {
+    exclusiveContent {
+        forRepository { maven { url = 'https://libraries.minecraft.net/' } }
+        filter { includeGroup 'org.lwjgl' }
+    }
+}
+def mc = providers.gradleProperty('mcVersion').getOrElse('1.21.1')
+def forgeVersions = ['1.20.1': '47.4.10', '1.21.1': '52.1.0']
+if (!forgeVersions.containsKey(mc)) throw new GradleException('Unsupported Minecraft version')
+java.sourceCompatibility = JavaVersion.toVersion(mc == '1.20.1' ? 17 : 21)
+java.targetCompatibility = java.sourceCompatibility
+minecraft { mappings channel: 'official', version: mc }
+dependencies {
+    minecraft "net.minecraftforge:forge:${mc}-${forgeVersions[mc]}"
+    implementation project(':common')
+    annotationProcessor 'org.spongepowered:mixin:0.8.5:processor'
+}
+sourceSets.main.java.srcDirs += ['../minecraft/src/main/java', "../minecraft/src/${mc}/java"]
+sourceSets.main.resources.srcDirs += ['../minecraft/src/main/resources']
+apply from: '../minecraft/build-info.gradle'
+mixin { add sourceSets.main, 'scopenet.refmap.json'; config 'scopenet.mixins.json' }
+processResources {
+    inputs.properties(version: project.version, mc: mc)
+    filesMatching('META-INF/mods.toml') { expand(version: project.version, mc: mc, forge: forgeVersions[mc].split('\\.')[0]) }
+}
+base.archivesName = "scopenet-forge-${mc}"
+jar {
+    from project(':common').sourceSets.main.output
+    manifest { attributes('MixinConfigs': 'scopenet.mixins.json') }
+    finalizedBy 'reobfJar'
+}