[CLI] Implement bounty command

[DavisVT]

Implement the bounty command that attaches a Stellar USDC bounty to a GitHub issue using Soroban smart contracts.

[oxravenz]

Perlu acceptance criteria minimum (UX command, argumen, output, jaringan/testnet, test requirements) sebelum eksekusi aman. Tanpa itu risiko mismatch tinggi. Mohon detail scope agar bisa lanjut implementasi end-to-end.

[mawroayb-ui]

Hi, I am interested in helping with this CLI task. Before starting, could you please confirm whether this issue has a paid bounty or reward attached, the reward amount, and the intended payment route and process? I want to make sure the scope and payout terms are clear before opening a PR. Thanks

[Euvouserdoutor]

Hi! I can take this and deliver a focused PR quickly. Before I start, can you confirm: (1) reward budget for this issue (I can do a fast turnaround for USD 13), (2) expected timeline, and (3) payout method (PayPal preferred)? I can start right after your approval.

[Euvouserdoutor]

Hi! I can take this task quickly and deliver a focused PR. Before I start, can you confirm: (1) budget/reward, (2) expected timeline, and (3) payout method (PayPal preferred)? I can start right after your approval.

[Thanhdn1984]

Submitted PR #8 for this: https://github.com/issueflow-buidl/issueflow-terminal/pull/8\n\nScope delivered: MVP bounty command with validation, GitHub issue lookup, Stellar USDC summary output, and dry-run mode. Contract submission remains stubbed until contract address/signing/API flow is confirmed.