Support query-based route rewrites

[VeeraVardhan35]

Adds support for query-based route patterns in routes.json, for example:

{
"/blog?customNamedId=:id": "/posts?id=:id"
}

This change:

• Parses route patterns with query params
• Matches req. path and req .query
• Extracts params lie: id
• Replaces params in destination URLs
• Rewrites req.url before existing API routing
• Preserves unrelated query params
• Leaves existing routes unchanged

Verified with:

• npm run lint
• npm run typecheck
• npm test