feat: add Injective Mainnet to Price API supported chains

[jeremy-consensys]

Explanation

Injective Mainnet (chain 0x6f0 / 1776) is missing from SPOT_PRICES_SUPPORT_INFO in assets-controllers. validateChainIdSupported('0x6f0') therefore returns false, so Extension and Mobile never call the Price API for any Injective token (native or ERC20). The wallet UI shows "no conversion rate available" for INJ and every Injective ERC20 (USDT, wETH, USDC, ATOM, TIA, stINJ).

This PR adds '0x6f0': 'eip155:1776/slip44:22000119' to SPOT_PRICES_SUPPORT_INFO — INJ's CAIP-19 asset identifier already exists in va-mmcx-price-api's slip44 map. Same one-line pattern as #7939 (Chiliz, Plasma).

The it.each(SUPPORTED_CHAIN_IDS) test at src/token-prices-service/codefi-v2.test.ts:1762 automatically covers the new entry.

The Injective EVM ERC20 contracts must also be wired up server-side in the Price API — that work lives in the companion PR (link below). Without it, this change unblocks native INJ but ERC20 prices still come back empty.

References

• NEB-549 — "Price Issues — Injective, Chiliz, Plasma, Rootstock"
• Pattern reference: chore: add chiliz and fix plasma for price api supported chains #7939 ("add chiliz and fix plasma for price api supported chains")
• Companion Price API PR:

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Low risk: a single new entry in the SPOT_PRICES_SUPPORT_INFO mapping plus a changelog note; impact is limited to enabling price lookups/validation for the new chain ID.

Overview
Enables Price API support for Injective Mainnet by adding chain 0x6f0 → eip155:1776/slip44:22000119 to SPOT_PRICES_SUPPORT_INFO (used for supported-network validation and native-asset CAIP-19 resolution).

Updates the assets-controllers changelog to document the new supported chain.

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