Clarify Slack and Matrix setup and preserve Apprise recovery severity

.github/workflows/test-apprise-services.yml

@@ -0,0 +1,50 @@
+name: Apprise Slack and Matrix
+
+on:
+  pull_request:
+    paths:
+      - '.github/workflows/test-apprise-services.yml'
+      - 'AppImage/scripts/notification_channels.py'
+      - 'AppImage/components/apprise-service-help.tsx'
+      - 'AppImage/components/notification-settings.tsx'
+      - 'tests/test_apprise_services.py'
+      - 'tests/test_apprise_service_help.cjs'
+  push:
+    branches: [main, develop]
+    paths:
+      - 'AppImage/scripts/notification_channels.py'
+      - 'AppImage/components/apprise-service-help.tsx'
+      - 'tests/test_apprise_services.py'
+      - 'tests/test_apprise_service_help.cjs'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  apprise-services:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    strategy:
+      matrix:
+        apprise: ['1.7.0', '2.0.1']
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - uses: actions/setup-node@v6
+        with:
+          node-version: '22.14.0'
+      - name: Install fixture dependencies
+        run: |
+          python -m pip install 'apprise==${{ matrix.apprise }}'
+          npm ci --prefix .github/ci/offline-node --ignore-scripts --no-audit --no-fund
+      - name: Test real provider plugins with mocked HTTP
+        run: python -B -m unittest discover -s tests -p test_apprise_services.py -v
+      - name: Render provider help and locale fallback
+        env:
+          NODE_PATH: ${{ github.workspace }}/.github/ci/offline-node/node_modules
+        run: node tests/test_apprise_service_help.cjs