feat(statics): add Katana Network (katanaeth/tkatanaeth) EVM statics

[bitgo-ai-agent-dev]

feat(statics): add Katana Network (katanaeth/tkatanaeth) EVM statics

Adds Katana Network (OP Stack L2, chain IDs 747474 mainnet / 737373 Bokuto testnet).
No custom coin module — reuses shared EVM SDK.

Changes

• modules/statics/src/base.ts: Added KATANAETH to CoinFamily and UnderlyingAsset enums
• modules/statics/src/networks.ts: Added KatanaEth and KatanaEthTestnet network classes; registered in Networks.main and Networks.test
• modules/statics/src/allCoinsAndTokens.ts: Added katanaeth and tkatanaeth account entries with shared EVM features
• modules/sdk-core/src/bitgo/environments.ts: Added explorer API URLs for katanaeth and tkatanaeth
• modules/statics/test/unit/fixtures/expectedColdFeatures.ts: Added katanaeth and tkatanaeth alphabetically

Linear: CECHO-808

[imkushagra12-bitgo]

Two missing changes needed

This PR is missing two files required for all new EVM chains. Please add the following before merging.

1. modules/statics/src/networkFeatureMapForTokens.ts

Add katanaeth with EIP-1559 features (same pattern as arbeth and opeth):

katanaeth: [...AccountCoin.DEFAULT_FEATURES, CoinFeature.EIP1559],

Insert alphabetically — after opeth, before polygon.

2. modules/statics/src/coins/ofcCoins.ts

Add OFC mainnet and testnet entries (follow the inketh pattern at lines 361–369):

ofc('<new-uuid>', 'ofckatanaeth', 'Katana', 18, UnderlyingAsset.KATANAETH, CoinKind.CRYPTO),
tofc(
  '<new-uuid>',
  'ofctkatanaeth',
  'Testnet Katana',
  18,
  UnderlyingAsset.KATANAETH,
  CoinKind.CRYPTO
),

Insert after the ofctinketh / ofchemieth block.

Reference PRs: #8506 (OFC change), #8652 (networkFeatureMapForTokens)

Linear: CECHO-1125

[linear-code]

CECHO-808

CECHO-1125

CECHO-1130