fix: typo 'FeeManger' -> 'FeeManager' in error message

[phessophissy]

Fixed:

"Only the FeeManger can make this call" → "Only the FeeManager can make this call"

---

Note

Minor text fix to improve error clarity.

• Update require message in FeeBase.onlyFeeManager from "Only the FeeManger can make this call" to "Only the FeeManager can make this call"

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