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.

README.md

@@ -25,7 +25,7 @@ Brand it, publish vanilla versions or modpacks, manage players, and push changes
 
 ### Launcher features
 
-- **Accounts** — panel accounts (username + password, offline-mode play), **Microsoft** sign-in, and local **offline** usernames. Tokens are encrypted with a key stored in Windows Credential Manager.
+- **Accounts** — private panel accounts (username + password, authenticated online-mode servers), and local **offline** usernames for local play. Tokens are encrypted with a key stored in Windows Credential Manager.
 - **Instances** — every instance the admin publishes shows up in the sidebar; group-restricted ones only for the right players.
 - **One-click play** — downloads the right **Java automatically**, the game, the mod loader and the modpack, with live speed/ETA. Files are shared between instances and verified by SHA-1.
 - **Built-in server** — the instance's server is added to the multiplayer list, **auto-joined** (Quick Play on 1.20+), and its live status (players, MOTD, ping) is shown on the home screen.
@@ -82,7 +82,8 @@ The workflow builds the **Windows installer**, pushes the **panel image to GHCR*
 
 ```
 crates/shared      Wire types shared by launcher and panel (manifest, branding, auth)
-crates/core        Launcher engine: Mojang/Java/loaders, file sync, launch, MS auth, ping
+crates/core        Launcher engine: Mojang/Java/loaders, file sync, launch, authlib, ping
+integrations/      Paper plugin and Fabric/Forge server mods
 panel/server       Admin panel API (Axum + SQLite)
 panel/web          Admin panel UI (Svelte 5)
 launcher/          Desktop launcher UI (Svelte 5)
@@ -95,7 +96,7 @@ docker-compose.yml Panel deployment
 ## Documentation
 
 - [Admin guide](docs/admin-guide.md) — deploying, HTTPS, modpacks, players, backups
-- [Microsoft sign-in setup](docs/microsoft-auth.md) — Azure app registration
+- [Official server setup](docs/server-integration.md) — private authentication, supported versions, activity and UUID protection
 - [Architecture](docs/architecture.md) — how the pieces fit, API reference
 - [Development](docs/development.md) — running everything locally, tests