How to set our own network as default network ?

### What is this about?

while create a new wallet account, it could be create by our own wallet? how could we do that?

### 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

- [ ] 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. Start by clarifying whether the request is to select a custom network as the default during wallet creation and what supported networks and expected behavior should be covered. Completion criteria are not provided.

Written by the indexing model from the issue text.