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/tasks/productivity/main.yml

@@ -27,4 +27,8 @@
 
 - name: Install pingvin
   import_tasks: pingvin.yml
-  tags: pingvin
+  tags: pingvin
+
+- name: Install obsidian-livesync
+  import_tasks: obsidian-livesync.yml
+  tags: obsidian-livesync