refactor(next-typed-href): move type aliases into defineTypedHrefWithNuqs closure

[amotarao]

概要

fix https://linear.app/plainbrew/issue/PC-63

packages/next-typed-href/src/nuqs.ts のトップレベル型エイリアスを defineTypedHrefWithNuqs のクロージャ内に移動。

• RouteHasParams → 外側クロージャ（Routes/RouteParamsMap をキャプチャ）
• SearchParamsFor / PathOptionsFor → 内側クロージャ（NuqsMap もキャプチャ）

index.ts の defineTypedHref と同じ構造に統一し、各型の型パラメータを削減。

参考

• PR #28 レビューコメント

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