GSoC: add noise filtering and HITL review logging endpoints

[norikokono]

Summary

This PR adds an initial backend slice for the GSoC Module B and Module D workflow.

• add a /rest/v1/filter_changes endpoint for classifying incoming changes as noise vs relevant
• add /rest/v1/review/action to persist reviewer decisions to JSONL logging
• add /rest/v1/review/queue to read back the logged review queue
• add focused tests for the new filter and review endpoints
• include small typing cleanups needed by the new code path

Notes

This is intended as the current stage submission for the Noise/Relevance Filter and HITL review flow.

Validation

I attempted to run the focused web tests in the dev container, but the environment here does not currently have the repo's Python dependencies installed (sqlalchemy is missing), so local test execution is blocked until dependencies are installed.

[norikokono]

I realized this PR includes an unrelated devcontainer.json change, so I’m closing it and will reopen a clean PR with only the Module B/D work. I’ll link the replacement PR shortly.