Use placeholder API key

[bukinoshita]

I don't know if this API key is still valid or not, but it would be good to not expose real API keys and use a placeholder one or add behind an environment variable.

If it's a valid API key, I'd also recommend going into resend and rotate that API key.

hono-server/src/lib/redisClient.ts

Line 6 in 9edeab8

const resendClient = new Resend('re_E3gaZP7L_M24jEkHXJWnPyxPRqo3hX9w8')