feat: add Obsidian LiveSync CouchDB service for note synchronization

- Add Obsidian LiveSync Docker service with CouchDB backend
- Configure service for Tailscale-only access on port 5984
- Add vault credentials for database authentication
- Create productivity category task and handler
- Enable Glance dashboard integration

🤖 Generated with [Claude Code](https://claude.ai/code)

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

roles/docker/handlers/main.yml

@@ -11,4 +11,11 @@
     project_src: /opt/stacks/caddy
     files:
       - compose.yml
+    state: restarted
+
+- name: restart obsidian-livesync
+  community.docker.docker_compose_v2:
+    project_src: /opt/stacks/obsidian-livesync
+    files:
+      - docker-compose.yml
     state: restarted