v2.3.1: CDN redirect gateway, fix token username bug

- Migrate patch downloads to auth server redirect gateway (302 -> CDN)
  Allows instant CDN switching via admin panel without launcher update
- Fix identity token "Player" username mismatch on fresh install
  Add token username verification with retry in fetchAuthTokens
- Refactor versionManager to use mirror manifest via auth.sanasol.ws/patches
- Add optimal patch routing (BFS) for differential updates
- Add PATCH_CDN_INFRASTRUCTURE.md documentation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hytale-f2p-launcher",
-  "version": "2.3.0",
+  "version": "2.3.1",
   "description": "A modern, cross-platform launcher for Hytale with automatic updates and multi-client support",
   "homepage": "https://github.com/amiayweb/Hytale-F2P",
   "main": "main.js",