Use safe string copies for pooled header buffers and simplify case-insensitive lookup buffering now that the pseudo stack path was ineffective. This addresses review concerns without changing the routing semantics.
Reuse fixed-path and Allow-header buffers so redirect and OPTIONS handling stop rebuilding temporary data on every request. Cache fallback chains and add regression coverage for redirect, 404, 405, and Allow behavior to keep the faster miss paths stable.
Avoid rebuilding skipped-node state during wildcard fallback so the matcher no longer loops on the same static branch and stops allocating on the hot path. Add focused route benchmarks and regression coverage to keep the optimized path stable.
The router could panic with a 'slice bounds out of range' error when handling requests that trigger its backtracking logic.
The root cause was a shallow copy of the node's `children` slice when creating a `skippedNode` for backtracking. This could lead to a corrupted state if the router needed to backtrack and then proceed down a wildcard path.
This commit fixes the issue by introducing a `copyChildren` method on the `node` struct, which creates a safe copy of the children slice. This method is now used when creating a `skippedNode`, ensuring that the backtracking logic is isolated and robust.
