feat(#687): Add platform fee mechanism to stream contract

[alexatsejames-alt]

Summary

• add platform fee configuration to stream initialization
• deduct fee from total amount before vesting
• send fee to configured recipient
• emit FeeCollected when fees are charged

Notes

• keeps zero-fee behavior unchanged
• validation still enforces net amount for split streams
  fixes [FEATURE] Add contract fee mechanism (platform fee on stream creation) #687

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