build(zstd): replace aircompressor with zstd FFM bindings

[dfa1]

Summary

Swaps the vortex.zstd encoding off io.airlift:aircompressor-v3 onto io.github.dfa1.zstd:zstd 0.1 — FFM bindings to the native libzstd. Drops every aircompressor/airlift mention from the tree.

What changed

• Deps: replaced in parent dependencyManagement, the BOM, and 9 module poms (reader, writer, calcite, integration, cli, jdbc, csv, parquet, performance). New zstd.version=0.1 property.
• Native: 0.1 bundles no native; libzstd loads from a /native/<platform>/ classpath resource shipped by a separate zstd-native-<platform> artifact. Two os-activated profiles pull in the matching native (osx-aarch64, linux-x86_64) at runtime scope. Other platforms need a profile added.
• Encoder/decoder — fully zero-copy: compress/decompress run on arena segments via ZstdCompressCtx.compress(arena, src) / ZstdDecompressCtx.decompress(dst, src), no heap byte[] bounce. The decoder writes each frame straight into its slice of the scan-arena output; I8/U8 encode input is now arena-allocated; buildLengthPrefixed returns an arena segment.
• CHANGELOG: user-facing Changed entry (consumers of vortex.zstd must declare zstd + the platform native artifact).

Testing

• 11 zstd encoder/decoder unit tests pass.
• 2 zstd interop ITs pass (Java writes zstd → Rust reads: i64 + utf8).
• Full reactor compiles; broad unit suite green.

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