ci: disable electron-builder GitHub publish; add Gitea sync workflow

- Use --publish never in pack/CI so tagged builds do not require GH_TOKEN.
- Set build.publish to null and align publish:win with local-only packaging.
- Add Gitea release sync workflow and upload script; fetch script from default
  branch so reruns work for tags that predate the script.

Co-authored-by: Cursor <cursoragent@cursor.com>

tools/fractured-launcher-electron/package.json

@@ -9,8 +9,8 @@
   },
   "scripts": {
     "start": "electron .",
-    "pack:win": "electron-builder --win nsis portable --x64",
-    "publish:win": "electron-builder --win nsis portable --x64 --publish always"
+    "pack:win": "electron-builder --win nsis portable --x64 --publish never",
+    "publish:win": "electron-builder --win nsis portable --x64 --publish never"
   },
   "author": "",
   "license": "GPL-3.0",
@@ -27,13 +27,7 @@
     "directories": {
       "output": "dist"
     },
-    "publish": [
-      {
-        "provider": "github",
-        "owner": "Dawnforger",
-        "repo": "Fractured-Distro"
-      }
-    ],
+    "publish": null,
     "files": [
       "main.js",
       "preload.cjs",