Rebalance swarm: promote all nodes to managers and remove hostname constraints

- Promoted p1, p2, p3 from worker to manager nodes for 4-node quorum
- Removed unnecessary hostname constraints from service configs
- Only traefik and portainer remain pinned to p0
- Services now auto-balance across all nodes via GlusterFS shared storage
- Updated README with cluster overview and distribution strategy

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

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

stacks/web/tracker/stack.yml

@@ -11,9 +11,6 @@ services:
     - /home/doc/swarm-data/appdata/webfiles/production/taylors-development:/usr/share/nginx/html:ro
     deploy:
       replicas: 1
-      placement:
-        constraints:
-        - node.role == worker
 networks:
   homelab:
     external: true