chore: unify log queries (#10152)

Unify log queries to only have SQLX code in the runtime and use it for
both the log client and for tests

codex-rs/state/src/lib.rs

@@ -12,6 +12,8 @@ mod paths;
 mod runtime;
 
 pub use model::LogEntry;
+pub use model::LogQuery;
+pub use model::LogRow;
 /// Preferred entrypoint: owns configuration and metrics.
 pub use runtime::StateRuntime;