fix: add bounty video bug-report challenge

[rafaio1]

Summary

Implemented the bounty video bug-report challenge with miner multipart upload, ffmpeg compression, OpenRouter DeepSeek V4 Flash 24h similarity rejection, and admin approval.

Changes

• Added Axum-based bounty service on :8095 with multipart upload and PostgreSQL persistence.
• Implemented ffmpeg video compression and OpenRouter DeepSeek V4 Flash similarity checks.
• Added admin approval workflow and score_epoch TARGET=50 emission with uid0 burn sink.
• Configured trust root weights: design 3000 bps / prism 4500 bps / bounty 2500 bps in challenges.toml.
• Handled edge cases: bad multipart (400), similarity reject within 24h (409), unauthorized admin (401).
• Added comprehensive documentation.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 0a9e883 and aaff842.

📒 Files selected for processing (6)

• config/challenges.toml
• docs/BOUNTY_CHALLENGE.md
• services/bounty/Cargo.toml
• services/bounty/src/db.rs
• services/bounty/src/handlers.rs
• services/bounty/src/main.rs

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