Consolidate issues related to `fedify init` and `test-init`

[2chanhaeng]

Summary

Consolidate issues related to fedify init and test-init like followings :

• [Proposal] npx create-fedify-app #351
• Add tests for init CLI and fix the command #461
• Separate @fedify/init from @fedify/cli #482
• Advice about server to users who use fedify test-init #485
• fedify init: Add @fedify/lint to generated projects by default #513

Problem

Handling issues related to fedify init and test-init separately would distribute responsibility and increase the likelihood of merge conflicts.

Proposed Solution

Consolidating them as a single issue and PR.

Alternatives Considered

No response

Scope / Dependencies

• packages/cli/src/init

[2chanhaeng]

@dahlia Can I take this issue?

[dahlia]

@2chanhaeng Sure, assigned!