feat(node): use morph da codec decoder

[curryxbo]

Summary

• Integrate github.com/morph-l2/morph-da-codec/bindings/decoder/zstd for node batch decompression.
• Remove legacy libscroll_zstd_* cgo link declarations to avoid linking duplicate Rust static libraries.
• Keep test payload compression compatible by producing zstd payloads without magic bytes.

Test plan

• CGO_ENABLED=1 go test ./zstd
• CGO_ENABLED=1 go test ./derivation
• CGO_ENABLED=1 go test ./... -run '^$'

Related issue: #1011

Made with Cursor

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• Commit unit tests in branch feat/morph-da-codec-decoder

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