fix:(PRO-264) apply pricing model to fee estimation

[amilz]

• Problem: The estimateTransactionFee RPC method was not applying the configured price model (margin/fixed/free), while signTransactionIfPaid was correctly applying it, leading to fee estimates that were insufficient on sign if paid
• Solution: Modified estimateTransactionFee to call get_required_lamports() with the price model configuration, matching the behavior in signTransactionIfPaid.

todo--add pricing scenarios to kora.toml test fixtures

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Important

Apply pricing model to estimateTransactionFee to ensure consistent fee estimation with signTransactionIfPaid.

• Behavior:
  • Modified estimateTransactionFee in estimate_transaction_fee.rs to apply pricing model using get_required_lamports().
  • Ensures fee estimates match those in signTransactionIfPaid by including margin or fixed amounts.
• Misc:
  • Renamed fee_in_lamports to min_transaction_fee for clarity in estimate_transaction_fee.rs.

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PRO-264 Fix: Estimate Fee needs to factor in price model

[ellipsis-dev]

Important

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1. crates/lib/src/rpc_server/method/estimate_transaction_fee.rs:53

• Draft comment:
  Renaming the fee variable to 'min_transaction_fee' clarifies that it represents the preliminary fee before pricing adjustments. Consider if a name like 'base_fee' might be even clearer.
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 50% None

2. crates/lib/src/rpc_server/method/estimate_transaction_fee.rs:61

• Draft comment:
  The updated code applies the pricing model via get_required_lamports, aligning with signTransactionIfPaid. Verify that passing Some(rpc_client) and Some(price_source.clone()) meets the expected type and behavior.
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 50% None

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