feat(services): embed camera calibration in stereo MCAP

[shark0F0497]

Summary

• accept optional camera_serial on task uploads and freeze the latest successful matching calibration
• embed the exact calibration result JSON as an MCAP attachment and verify it during Stereo Split QA
• size Stereo Split scratch requests dynamically while enforcing a fixed 100Gi per-job limit

Behavior

• uploads without camera_serial or without a matching calibration continue without an attachment
• matching is global, case-sensitive, and based only on camera_serial
• scratch request is max(4Gi, ceil(3 x source size + 1Gi)); jobs requiring more than 100Gi fail before Orbit submission

Verification

• go test -cover -race ./...
• golangci-lint run ./...
• 35 Stereo Split Python tests passed