Warren 960ee87ce9 Add S3 VFS backend: VfsBackend impl for S3-compatible storage ...

- S3Vfs with all 15 VfsBackend methods via rusty-s3 + ureq
- S3VfsFile for buffered writes + ranged reads
- AWS Signature V4 pre-signed URLs (rusty-s3)
- ListObjectsV2 for directory listing (prefix + delimiter)
- Path-style URL mapping (/path to bucket/key)

2026-06-18 23:44:52 +08:00

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