Vale v0.1.2

• Added built-in forward auth middleware and Traefik-compatible forwardauth.* labels.
• Added gossip-based cluster discovery backed by memberlist, with Dragonboat membership still controlled by the Raft leader.
• Added container-validated auto-discovery flow for metadata, data, and certificates Raft groups.
• Updated selected dependencies while preserving Dragonboat-compatible dependency boundaries.
• Fixed extension component example module metadata for logx.