Status LEDs, image model selection, backup restore, provider test, monthly versions

- Sidebar: three status LEDs (server, models, MCP) with an overview popover (/api/status)
- Images: preview stage, purpose-based model choice and reference images
  (Nano Banana Pro edit refines the chosen preview)
- Settings: restore a stored or uploaded backup (staged, applied on restart)
- Provider form: test connection; saving or reloading re-checks the status at once
- opencode Zen/Go: send x-opencode-session with a stable id per conversation
- Releases are named vYYYYMM-NNNNN; scripts/release.sh numbers, tags, builds and publishes
- Fix: backups made in the same second no longer overwrite each other

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docker-compose.release.yml

@@ -15,7 +15,7 @@
 #   /data/home          home directory of the agent (git config, caches, ...)
 services:
   codecraft:
-    # Pin a version (e.g. :0.1.0) or follow :latest.
+    # Pin a version (e.g. :v202611-00001) or follow :latest.
     image: git.familie-zink.org/zink/codecraft:${CODECRAFT_VERSION:-latest}
     container_name: codecraft
     restart: unless-stopped