Refactor wildcard matching logic in TrieRouter

[google-labs-jules]

This PR refactors the wildcard matching logic in routers/trie.go. Previously, the code manually reconstructed the captured wildcard path by concatenating the current path segment and the remaining search path. This was marked as a "hack" in the comments.

The new implementation captures the state of the search path (currentPath) at the beginning of each loop iteration. When a wildcard node is matched, this captured path is used directly as the parameter value. This approach is cleaner, more robust, and avoids unnecessary string concatenation.

Tests were added (and subsequently removed after verification) to ensure that edge cases like double slashes (e.g., /static/a//b) are handled correctly and consistently with the previous behavior. Existing tests in routers/trie_test.go also pass.

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PR created automatically by Jules for task 17146026927635272500 started by @bernardoforcillo

[google-labs-jules]

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