fix(test): cover QueryExpr::TimeShift in the netflow corpus visitor

[zzylol]

main currently does not compile:

$ cargo test -p asap-frontend-sql --test netflow
error[E0004]: non-exhaustive patterns: `&QueryExpr::TimeShift { .. }` not covered
   --> crates/frontend-sql/tests/netflow/netflow.rs:257:11

Cause

#106 added QueryExpr::TimeShift (the offset / @ lowering for #40). #107 added the netflow corpus, whose visit() matches QueryExpr exhaustively, and was branched before #106 landed. Each PR was green against its own base; neither was rebased before merge, so the conflict only materialised once both were on main. It is a semantic conflict, not a textual one, so git merged it cleanly.

Fix

TimeShift { shift, child } is a single-child pass-through, so it joins the existing recurse-into-child arm.

Verification

cargo clippy --all-targets     # clean, was: error[E0004]
cargo test --workspace         # all green

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