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.

.env.example

@@ -6,3 +6,6 @@ JWT_SECRET=
 CURSEFORGE_API_KEY=
 MAX_UPLOAD_MB=2048
 RUST_LOG=info
+PUBLIC_URL=
+# Comma-separated IPs of your reverse proxies; blank means forwarded IP headers are ignored.
+SCOPENET_TRUSTED_PROXIES=