This PR transitions the ZTNet project from the Page Router to the App Router, reworking the entire codebase. While this is a substantial rewrite, it provides the opportunity to implement long-desired changes.

Pros:

• Improved Server-Side Rendering: Faster initial load times and enhanced performance.
• Streaming Support: Enables a smoother, more responsive user experience.
• WebSocket Integration: Delivers instant updates across the board.
• Enhanced Data Handling: A new network data picker will be implemented to give more granular control over the data required in the frontend. This addresses issues some users faced, such as input fields losing focus during polling updates.

Cons:

• Large Scope: A significant and complex undertaking.

Resolves #543