fix: make Next.js type imports version-agnostic (closes #218)

[mushan0x0]

Summary

Fixes #218.

With Next.js 16, TypeScript fails to build projects that consume this package with errors like:

Cannot find module 'next/dist/server/config-shared' or its corresponding type declarations.
Cannot find module 'next/dist/server/web/next-url' or its corresponding type declarations.
Cannot find module 'next/dist/compiled/@edge-runtime/cookies' or its corresponding type declarations.

The root cause is that packages/next-rest-framework/src/app-router/route-operation.ts imports several types from internal Next.js paths under next/dist/**. Those paths are not part of Next's public API; their layout and exports change between Next versions, so the package breaks whenever Next reorganizes its internals (Next 16 is the latest instance).

Changes

In packages/next-rest-framework/src/app-router/route-operation.ts, replace internal imports with types derived from Next.js's public API, so the package is compatible across Next 13/14/15/16 without depending on internal file structure:

• NextURL → NextRequest['nextUrl'] (from next/server).
• ResponseCookies → NextResponse['cookies'] (from next/server).
• I18NConfig → NonNullable<NextConfig['i18n']> (from next), instead of next/dist/server/config-shared.

Also bumps next in dev/peer dependency ranges to cover 16.x and refreshes the lockfile.

Verification

• pnpm --filter next-rest-framework lint (i.e. tsc) passes.
• No more references to next/dist/** in the package's source types, so consumers on Next 13–16 no longer hit the missing-module errors from Compatibility issues with Next 16 #218.

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