refactor: remove unused projects and terminal entrypoints

[Che-Zhu]

Summary

• remove unused app/api/projects/route.ts
• remove unused hooks/use-projects.ts
• remove unused hooks/use-terminal.ts
• update lib/fetch-client.ts example paths to generic endpoint names

Validation

• pnpm -s lint

Notes

• keeps unrelated local changes out of this PR

[github-actions]

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  Commit: 716de2cd5231dda0b43d259afd1b02289e1b8dd2
  Branch: codex/cleanup-projects-entrypoints

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