fix(routes): Handle Unmatched Routes with router.use for Proper 404 Responses

[TKanX]

Summary:

Fixed the issue where unmatched routes were not properly handled, causing incorrect 404 behavior.

Changes:

• Updated the unmatched routes handler in index.js to use router.use('*', ...) instead of router.get('*', ...).
• Ensured all unmatched routes return a 404 response with a consistent format.

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