feat: add allowed tokens backend

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What does this PR do?

🤖[deprecated] Generated by Copilot at cded0ab

This pull request adds a new table AllowedToken to the database and the Prisma schema file, which allows the hey app to store and query information about tokens that are supported by the app. The table has a unique index on the contractAddress column to prevent duplicates.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖[deprecated] Generated by Copilot at cded0ab

• Create a new table AllowedToken to store allowed tokens in the database (link)
• Add a unique index on the contractAddress column of the AllowedToken table to prevent duplicates (link)
• Update the Prisma schema file schema.prisma to define a new model AllowedToken that matches the table definition (link)

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