feat: Implement admin panel, user auth, wallet, and token-based credits

[Muhammad-Midhlaj]

• Initializes backend services within the Next.js structure.
• Integrates user authentication with existing NextAuth.js setup, adding walletBalance and isAdmin fields to the User model.
• Implements a wallet system with API endpoints for balance viewing and server-side functions for crediting/debiting.
• Calculates and awards wallet credits based on AI token usage in chat interactions.
• Creates a basic admin panel for user listing and manual wallet balance adjustments, protected by admin-only authorization.
• Adds Playwright integration tests for the new wallet and admin API routes.

[vercel]

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	pg-hstore@​2.3.4
	bcryptjs@​3.0.2
	jsonwebtoken@​9.0.2
	sequelize@​6.37.7
	express@​5.1.0
	pg@​8.16.2

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[yantakus]

Looks pretty raw. I don't see any place in the UI where users can see their credit balance info. Is it WIP?

For the admin panel, I'd use Payload CMS - it is very easy to integrate into any next.js project, it works with drizzle and automatically creates admin pages based on project's schema.