ci: remove workflows that call the retired CI system

Owner decision 2026-11-07: only KofTwentyTwo/ci-workflows remains.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/qrun-android-release.yaml

@@ -1,13 +0,0 @@
-name: QRun Android lifecycle
-'on':
-  push:
-    branches: [main]
-  workflow_dispatch:
-permissions:
-  contents: read
-  actions: read
-jobs:
-  release:
-    uses: self:KofTwentyTwo/platform-ci/.gitea/workflows/android.yaml@qrun-release-v1
-    with:
-      runner: android-build