feat: add GET /hello endpoint for bot detection verification (#120)

[Lixianqi666]

Summary

Closes #120 — adds a simple GET /hello endpoint that returns { ok: true }.

Changes

File: apps/api/src/routes/api.ts

Added a new route:

router.get('/hello', (_req: Request, res: Response) => {
  return res.json({ ok: true });
});

Acceptance Criteria

• Route responds 200
• JSON body is { "ok": true }
• PR references this issue

Closes #120

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