fix: quota scopes

[ngovinh2k2]

What?

Why?

How?

Testing?

• Functional Testing
• Security
• Performance
• Error Handling
• Code Quality
• Documentation
• Database
• Deployment
• Final Review

Anything Else?

[gemini-code-assist]

Code Review

This pull request refactors the device quota and downgrade task to use the FeatureCode and FeatureUsageScope constants instead of hardcoded strings. A critical issue was identified in the downgrade task where using the FeatureCode Enum directly as a key lookup in the limits dictionary will fail, because the dictionary keys are serialized as strings when passed through Celery. It is recommended to use .value to access the underlying string representation of the Enum.

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