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.
