Gateway - Solana wallet creation fails when nodeURL has leading whitespace

Describe the bug

While adding a Solana wallet through the Gateway wallet flow, the request failed instead of creating the wallet. Gateway returned Endpoint URL must start with http: or https: from /wallet/add.

#### HAPI logs
2026-09-11 00:17:42 | info |    Adding new wallet for chain: solana
2026-09-11 00:17:42 | error |   Unhandled error: {
  "error": "Endpoint URL must start with `http:` or `https:`.",
  "url": "/wallet/add",
  "params": {}
}

The configured solana-mainnet-beta nodeURL contained a leading space before https://. Gateway accepted this configuration but passed the untrimmed value to the Solana client, which rejected it while the connection was being initialized. Removing the leading space allows the endpoint to use the expected URL format. Gateway should trim surrounding whitespace or reject the value when the configuration is saved, before it can break wallet operations.

Current shape:
  nodeURL: ' https://...'

Required shape:
  nodeURL: 'https://...'

This was found during QA testing after whitespace was accidentally added to the saved nodeURL. Solana is the confirmed reproduction. Ethereum was not tested, but the same mistake may affect Ethereum and other networks that accept a user-provided node URL, so those network configurations should be checked as well.

Fixed after i remove the whitespace

Steps to reproduce bug

1. Configure the Solana mainnet-beta nodeURL with a leading space before https://
2. Save the network configuration
3. Attempt to add a new Solana wallet
4. Check the Gateway response or log for Endpoint URL must start with http: or https:

Start at the Gateway /wallet/add flow and the network configuration handling for the Solana nodeURL; reproduce the failure with a leading space before https://. Check how the saved value reaches client initialization and verify that a configured URL with surrounding whitespace no longer breaks wallet creation, or is rejected when saved; check whether the same path serves other networks.