CI: move workflow to .forgejo/workflows; self-contained Forgejo release; bump 0.1.1

- .forgejo/workflows/build-apk.yml (Forgejo's location): on v* tag, build signed
  APK using the Actions secrets and publish via the Forgejo API (curl + auto token),
  no external action. Best-effort NDK install for the RN version.
- Remove the old .gitea workflow to avoid double runs.
- Bump app version to 0.1.1.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/app.json

@@ -3,7 +3,7 @@
     "name": "BigBrainParking",
     "slug": "bigbrainparking",
     "scheme": "bigbrainparking",
-    "version": "0.1.0",
+    "version": "0.1.1",
     "orientation": "portrait",
     "userInterfaceStyle": "automatic",
     "newArchEnabled": true,