feat: add macOS build, Docker image, and CI workflows

macOS (.dmg):
- Add mac build config to apps/desktop/package.json (x64 + arm64 DMGs)
- .github/workflows/build-mac.yml — builds on macos-latest, uploads to release

Docker (headless scheduler + web remote):
- docker/server.js — Node.js entry point using homebridge-plugin lib;
  REST API + WebSocket, serves mobile web UI on PORT (default 3456)
- docker/package.json — production deps (adm-zip, axios, sql.js, ws, xml2js, xmlbuilder2)
- Dockerfile — node:20-alpine image; VOLUME /data for persistent config
- .github/workflows/build-docker.yml — builds linux/amd64+arm64,
  pushes to ghcr.io/k0rb3nd4ll4s/dibby-wemo-manager

Usage:
  docker run -d --network host -v /opt/wemo:/data \
    ghcr.io/k0rb3nd4ll4s/dibby-wemo-manager:latest

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "dibby-wemo-docker",
+  "version": "2.0.0",
+  "description": "Dibby Wemo Manager — headless scheduler + web remote",
+  "main": "server.js",
+  "dependencies": {
+    "adm-zip": "^0.5.14",
+    "axios": "^1.7.0",
+    "sql.js": "^1.12.0",
+    "ws": "^8.18.0",
+    "xml2js": "^0.6.2",
+    "xmlbuilder2": "^4.0.3"
+  }
+}