Remove committed legacy DLQ file and gitignore runtime logs

[robertocarlous]

Acceptance criteria

• Remove logs/dead_letter_queue.json from repo (migration path already exists)
• Ensure logs/ and postgres/ volumes are gitignored
• README note on DLQ storage in DB only

[Emoji-dot]

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I would like to work on this issue

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[Emmy123222]

@Emmy123222 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Can i work on this ??

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Congratulations, @Emmy123222! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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This issue has been completed by @Emmy123222 as part of the Stellar Wave Program's 5th Wave 🥳

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