[iOS] Defer Contact to Wallet Endpoint

[jonathansampson]

Description

On a fresh install of Brave (prior to enabling Wallet features), opening the Settings view results in at least one call (and sometimes up to 4) to ratios.wallet.brave.com.

Samples (all to http://https://ratios.wallet.brave.com/v2/relative/provider/coingecko):

• /fil,matic,neon,btc,avax,eth,bnb,sol,0x0d8775f648430679a709e98d2b0cb6250d2887ef/usd/1d
• /neon,avax,btc,0x0d8775f648430679a709e98d2b0cb6250d2887ef,bnb,eth,sol,fil,matic/usd/1d
• /0x0d8775f648430679a709e98d2b0cb6250d2887ef,avax,fil,btc,sol,matic,bnb,eth,neon/usd/1d
• /btc,bnb,eth,neon,matic,avax,fil,sol,0x0d8775f648430679a709e98d2b0cb6250d2887ef/usd/1d
• /btc,eth,bnb,sol,0x0d8775f648430679a709e98d2b0cb6250d2887ef,avax,matic,fil,neon/usd/1d

Steps to reproduce

1. Install/Reset Brave
2. Open the Settings menu

Actual result

Calls to ratios.wallet.brave.com are issued.

Expected result

Ideally, no wallet-related calls should be issued unless the user has enabled the Wallet feature.

Reproduces how often

Easily reproduced

Brave version

1.76.77

Device/iOS version

iPhone 15 Pro Max, iOS 18.3.2

Affected browser versions

• latest AppStore
• latest TestFlight
• previous TestFlight

Reproducibility

• with Brave Shields disabled
• in the latest version of mobile Safari

Miscellaneous information

This seems to be due to initialization of CryptoStore in settings for the NetworkStore. In interim I believe we'll need to initialize NetworkStore on it's own again, but be careful to regression test against brave-ios#5848. And likely additional checks against wallet created and locked to prevent again later (keyring service isLocked returns false if wallet is not setup, triggering update).