feat(launcher): Linux play wrapper, patch UX, Gitea sync cleanup

- Play on Linux: use launch.linux_wrapper (wine) or linux_steam_uri; chmod .exe after install
- Windows: retry EBUSY on MPQ replace; download to .new before rename
- After successful sync: remove .bak-* backups; realmlist only Data/enUS (ignore enGB)
- Gitea/distro merge: skip Fractured-Launcher* from GitHub assets (CI default-branch build wins)
- Omit blockmap and builder-debug from staged artifacts and Gitea uploads; upload script validates before clearing attachments
- README and launcher version 1.0.12

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

tools/fractured-launcher-electron/default-launcher.json

@@ -25,7 +25,7 @@
   "realmlist": {
     "enabled": true,
     "line": "set realmlist fracturedwow.ddns.net:47497",
-    "paths": ["Data/enUS/realmlist.wtf", "Data/enGB/realmlist.wtf"]
+    "paths": ["Data/enUS/realmlist.wtf"]
   },
   "auth": {
     "enabled": false,
@@ -37,6 +37,9 @@
   "launch": {
     "exe": "Wow.exe",
     "args": [],
-    "linux_wrapper": ["wine"]
+    "linux_wrapper": ["wine"],
+    "linux_steam_uri": "",
+    "linux_steam_binary": "",
+    "linux_steam_spawn": []
   }
 }