feat: replace MinIO fork with SeaweedFS-engine Hanzo S3
Kill MinIO; migrate object storage to SeaweedFS, rebranded Hanzo S3.
- module github.com/hanzoai/s3 (all 1920 imports rewritten); seaweedfs/{raft,goexif,go-fuse,cockroachdb-parser} kept as deps
- binary weed -> s3; display brand SeaweedFS -> Hanzo S3 (Server/version/admin); wire identifiers unchanged for S3 compat
- Dockerfile builds s3 (CGO_ENABLED=0, ldflags) -> ghcr.io/hanzoai/s3 via shared CI
- MinIO preserved in git history (prior main)
zeekay
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