feat(launcher): Linux AppImage 1.0.2, Gitea sync + CI, manual pack script

- Add pack:linux (AppImage x64), linux/appImage artifact names in package.json.
- Gitea sync: parallel build-electron-linux, merge Windows+Linux into Gitea upload;
  rename Windows artifact to electron-dist-windows.
- Fractured launcher CI: electron-launcher-windows + electron-launcher-linux jobs.
- scripts/manual-pack-linux.sh for local test builds from current tree.
- Normalize Gitea base_url (prepend https if missing); baked channel uses full URL.

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

tools/fractured-launcher-electron/package.json

@@ -1,6 +1,6 @@
 {
   "name": "fractured-launcher-electron",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "Fractured WoW launcher (Electron) — no console window, native folder picker, auto-update",
   "main": "main.js",
   "repository": {
@@ -10,6 +10,7 @@
   "scripts": {
     "start": "electron .",
     "pack:win": "electron-builder --win nsis portable --x64 --publish never",
+    "pack:linux": "electron-builder --linux AppImage --x64 --publish never",
     "publish:win": "electron-builder --win nsis portable --x64 --publish never"
   },
   "author": "",
@@ -59,6 +60,18 @@
     },
     "portable": {
       "artifactName": "Fractured-Launcher-${version}-Windows-Portable.${ext}"
+    },
+    "linux": {
+      "target": [
+        {
+          "target": "AppImage",
+          "arch": ["x64"]
+        }
+      ],
+      "category": "Game"
+    },
+    "appImage": {
+      "artifactName": "Fractured-Launcher-${version}-Linux-x86_64.${ext}"
     }
   }
 }