feat: custom fees

[vgorkavenko]

Description

• Operators can lower fees instantly, while increases require a cooldown.
• Allocation weight follows pending increases immediately.
• Per-type bonuses affect effective fees without changing allocation weight.
• Invalid fees can be normalized permissionlessly.
• Fee parameters and cooldowns remain governance-controlled.

Checklist

• Appropriate PR labels applied
• Test coverage maintained (just coverage)
  • Tests are added/updated
• Documentation maintained
  • No need to update

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