Add Network Token

Add a custom token to Gateway's token list for a specific network.

Args: network_id: Network ID in format 'chain-network' (e.g., 'solana-mainnet-beta', 'ethereum-mainnet') token_request: Token details (address, symbol, name, decimals)

Example: POST /gateway/networks/ethereum-mainnet/tokens { "address": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48", "symbol": "USDC", "name": "USD Coin", "decimals": 6 }

Note: After adding a token, restart Gateway for changes to take effect.