feat: add hamh-alpha addon for testing pre-release versions

hamh-alpha/CHANGELOG.md

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+# Changelog - Home-Assistant-Matter-Hub (Alpha)
+
+⚠️ **WARNING: This is an alpha version for testing purposes only!**
+
+This addon contains pre-release features that may be unstable or incomplete.
+Use at your own risk and please report any issues on GitHub.
+
+---
+
+## [1.4.0-alpha.1] - Initial Alpha Release
+
+### New Features
+- **Health Check API** (`/api/health`) with uptime, status, and service info
+- **Kubernetes-ready probes** (`/api/health/live`, `/api/health/ready`)
+- **WebSocket live updates** (`/api/ws`) for real-time bridge status
+- **Entity Mapping Customization**:
+  - Override Matter device types per entity
+  - Custom names for entities
+  - Disable entities from bridge
+
+### Technical Changes
+- Node.js 24 (LTS)
+- Dropped armv7 support (only amd64 + arm64)