Implement tryluck omikuji command

[fluo10]

Summary

Add an omikuji subcommand that randomly draws one of the traditional Japanese fortune levels.

Behavior

• Outputs one of: 大吉、中吉、吉、小吉、凶
• Probability distribution: uniform (each outcome has equal probability)
• Supports --json flag for structured output (consistent with other commands)
• Supports an English output option (flag name TBD: e.g. --english, --lang en) that outputs either a romanization or English translation

Example Usage

$ tryluck omikuji
大吉

$ tryluck omikuji --json
{"result": "大吉"}

$ tryluck omikuji --english   # flag name TBD
Daikichi

Notes

• No official specification exists for omikuji probability distributions (varies by shrine/temple), so uniform distribution is used intentionally
• English output flag name is TBD — consider consistency with any future i18n approach