Request: Add QIE Blockchain & Native QIE USD Pricing

### What is this about?

Hello MetaMask Team,

We would like to request official support for the QIE Blockchain,
including native QIE coin USD price display inside MetaMask.

This is a request for official support of a new Layer-1 blockchain
and native asset pricing, not a bug report.

Blockchain details:
- Network name: QIE Blockchain
- Chain type: Layer-1 (EVM-compatible)
- Native coin: QIE
- Chain ID: 1990
- RPC URL(s): https://rpc1mainnet.qie.digital
- Block Explorer: https://mainnet.qie.digital/

Market data & legitimacy:
- CoinGecko listing: https://www.coingecko.com/en/coins/qi-blockchain
- CoinMarketCap listing: https://coinmarketcap.com/currencies/qi-blockchain
- ChainList url - https://chainlist.org/?search=1990
- Centralized exchange listings: MEXC, XT, BitMart
- Active trading volume and market cap available on CoinGecko

Observed behavior:
- QIE USD price was visible in older MetaMask versions
- In current MetaMask versions, native QIE balance is displayed,
but the USD fiat value is not shown

Request:
- Add QIE Blockchain to MetaMask supported networks
- Enable native QIE coin USD pricing via MetaMask price feed

We are happy to provide any additional technical or validation
information if required.

Thank you for your time and consideration.

### Scenario

_No response_

### Design

_No response_

### Technical Details

_No response_

### Threat Modeling Framework

_No response_

### Acceptance Criteria

_No response_

### Stakeholder review needed before the work gets merged

- [x] Engineering (needed in most cases)
- [ ] Design
- [ ] Product
- [ ] QA (automation tests are required to pass before merging PRs but not all changes are covered by automation tests - please review if QA is needed beyond automation tests)
- [ ] Security
- [ ] Legal
- [ ] Marketing
- [ ] Management (please specify)
- [ ] Other (please specify)

### References

_No response_

The issue names no files, tests, or entry points and provides no technical details or acceptance criteria. Start by reviewing how MetaMask supports networks and native-asset price feeds, then define the validation needed for QIE network support and USD pricing. Done would require both requested capabilities and agreed acceptance criteria.

Written by the indexing model from the issue text.