Remove default gasPrice settings for Avalanche Fuji and Arbitrum Sepolia configurations

Author: Le-Caignec

packages/smart-contract/hardhat.config.ts

@@ -6,14 +6,12 @@ const privateKey = env.WALLET_PRIVATE_KEY;
 
 // Avalanche Fuji specific configuration
 const fujiBaseConfig = {
-    gasPrice: 25_000_000_000, // 25 Gwei default
     blockGasLimit: 8_000_000,
     chainId: 43113,
 };
 
 // Arbitrum Sepolia specific configuration
 const arbitrumSepoliaBaseConfig = {
-    gasPrice: 100_000_000, // 0.1 Gwei default (Arbitrum has lower gas prices)
     blockGasLimit: 30_000_000, // Arbitrum has higher block gas limits
     chainId: 421614,
 };