Add ERC-8004 chain name mapping to web UI

Add human-readable chain names for all 16 supported ERC-8004 networks:

- CHAIN_NAMES mapping (ETHEREUM_MAINNET → Ethereum, etc.)
- Verdict card shows chain name (e.g. On-chain · Verified · Base)
- Detail section shows chain name instead of alias
- Source: https://www.8004scan.io/networks