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>

README.md

@@ -1,3 +1,50 @@
 # swarm-production
 
-Production Docker Swarm Infrastructure
+Production Docker Swarm Infrastructure
+
+## Cluster Overview
+
+### Nodes
+- **p0** (Manager/Leader) - Infrastructure services
+- **p1** (Manager) - Application services
+- **p2** (Manager) - Application services
+- **p3** (Manager) - Application services
+
+All nodes are managers providing a 4-node quorum (can tolerate 2 node failures while maintaining quorum).
+
+### Storage
+- **GlusterFS** mounted at `/home/doc/swarm-data/` on all nodes
+- Shared storage enables services to run on any node without storage constraints
+
+## Service Distribution Strategy
+
+### Pinned Services
+Services that must run on specific nodes:
+
+- **traefik** (p0) - Published ports 80/443, needs stable IP for DNS
+- **portainer** (p0) - Management UI, stays with leader for convenience
+- **rsync** (manager constraint) - Backup service, needs manager access
+
+### Floating Services
+Services that can run on any node (swarm auto-balances):
+
+- adminer
+- authentik (server, worker, redis)
+- n8n
+- paperless (webserver, redis)
+- tracker-nginx
+- uptime-kuma
+
+## Recent Changes (2025-10-30)
+
+### Swarm Rebalancing
+- Promoted p1, p2, p3 from workers to managers
+- Removed unnecessary hostname constraints from service configs
+- Force-redeployed services to redistribute across all nodes
+- Verified GlusterFS accessibility on all nodes
+
+### Results
+- Achieved balanced workload distribution across all 4 nodes
+- Improved high availability with 4-node manager quorum
+- Services now self-balance automatically when nodes fail/recover
+- Fixed Portainer agent connectivity by restarting agents after manager promotion