Build Watchlist Management Page

[mijinummi]

🧠 Concept

Allow users to manage monitored wallets and contracts.

⚠️ Problem

Monitoring targets must be configurable.

📁 Implementation Scope

• apps/web/app/watchlists/

✅ Requirements

• Add watchlist items
• Remove watchlist items
• Edit watchlist items

🎯 Acceptance Criteria

• CRUD operations supported
• Validation implemented
• API integration complete

[Chongai-Cli]

Hello maintainer, can i be assigned to this issue?