🛠️ Add scaffolding for Synology Docker deployment

resources/skills/synology-docker-deploy/references/env-vars.md

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+# Required Runtime Variables
+
+Populate these values in `deploy/synology/deploy.env` in the target project:
+
+- `SYNOLOGY_USER`
+- `SYNOLOGY_SSH_PORT`
+- `SYNOLOGY_HOST_INTERNAL`
+- `SYNOLOGY_HOST_EXTERNAL`
+- `REMOTE_APP_PATH`
+- `SERVICE_NAME`
+- `IMAGE_NAME`
+- `IMAGE_TAG`
+- `APP_PORT`
+- `CONTAINER_PORT`
+- `DEPLOY_TARGET` (`internal` or `external`)