Replace the NextAuth Credentials provider wrapper with direct EncryptID
SDK integration. The auth() function now reads the encryptid_token cookie
directly, keeping the same interface so all API routes and server
components work unchanged.
- Replace SessionProvider with EncryptIDProvider
- Add /api/auth/session endpoint for cookie management
- Update signin/signup pages to use SDK login/register + cookie sync
- Update Navbar to use useEncryptID() hook
- Remove next-auth, @auth/prisma-adapter, bcryptjs dependencies
- Drop Account, Session, VerificationToken Prisma models + DB tables
- Remove legacy email/password register route
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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