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.

docs/development.md

@@ -34,3 +34,7 @@ cargo fmt --all && cargo clippy --workspace --all-targets -- -D warnings
 ## Releasing
 
 Push a tag `vX.Y.Z` or run the **Release** workflow. It stamps the version into `Cargo.toml` and `tauri.conf.json`, builds the NSIS installer on Windows, pushes the multi-arch panel image to GHCR, and publishes the release.
+
+## Server integrations
+
+See [server integration builds and validation](server-integration.md#build-and-verify). The Java modules live under `integrations/` and the release workflow publishes the per-loader/per-version JARs.