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This change adds volume-level encryption support for S3 uploads, similar to the existing -filer.encryptVolumeData option. Each chunk is encrypted with its own auto-generated CipherKey when the flag is enabled. Changes: - Add -s3.encryptVolumeData flag to weed s3, weed server, and weed mini - Wire Cipher option through S3ApiServer and ChunkedUploadOption - Add integration tests for multi-chunk range reads with encryption - Tests verify encryption works across chunk boundaries Usage: weed s3 -encryptVolumeData weed server -s3 -s3.encryptVolumeData weed mini -s3.encryptVolumeData Integration tests: go test -v -tags=integration -timeout 5m ./test/s3/sse/...