ci: group cloud, desktop, mobile in one release workflow (#12802)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Introduced new workflows for preparing releases, cloud deployment, and
coordinated multi-platform releases with manual approval for stable
Docker images.
- Added a reusable action to output app version, Git hash, and build
type for consistent release metadata.

- **Refactor**
- Simplified and unified input handling across workflows, requiring
explicit version and build metadata inputs.
- Updated release workflows (desktop, mobile, cloud) to use direct
inputs instead of deriving values internally.

- **Chores**
- Removed several legacy and redundant workflows, including automatic
deployment, release, label checking, auto-assign, and Helm chart
publishing.
- Deleted jobs and workflows related to self-hosted image builds, mobile
app test builds, and previous deployment processes.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/actions/setup-version/action.yml

@@ -1,24 +1,12 @@
 name: Setup Version
 description: 'Setup Version'
-outputs:
-  APP_VERSION:
+inputs:
+  app-version:
     description: 'App Version'
-    value: ${{ steps.version.outputs.APP_VERSION }}
+    required: true
 runs:
   using: 'composite'
   steps:
     - name: 'Write Version'
-      id: version
       shell: bash
-      run: |
-        if [ "${{ github.ref_type }}" == "tag" ]; then
-          APP_VERSION=$(echo "${{ github.ref_name }}" | sed 's/^v//')
-        else
-          PACKAGE_VERSION=$(node -p "require('./package.json').version")
-          TIME_VERSION=$(date +%Y%m%d%H%M)
-          GIT_SHORT_HASH=$(git rev-parse --short HEAD)
-          APP_VERSION=$PACKAGE_VERSION-nightly-$GIT_SHORT_HASH
-        fi
-        echo $APP_VERSION
-        echo "APP_VERSION=$APP_VERSION" >> "$GITHUB_OUTPUT"
-        ./scripts/set-version.sh $APP_VERSION
+      run: ./scripts/set-version.sh ${{ inputs.app-version }}