Build AutoQuant Studio research workbench

[2233admin]

Summary

• add strict price/event intake, immutable ComputeJob, factor truth testing, supervised model runs, and governed RL evidence
• connect the Next.js factor/replay/cohort/results/data/jobs/audit workbench to AutoQuant Core
• use public Mantine 9.5.1 primitives for generic UI while preserving AutoQuant domain components and design tokens
• keep private GPU/MOSS/provider plugins and all trading capabilities outside the public boundary

Validation

• GitHub CI: Core changed-contract suite passed
• GitHub CI: frontend tests, lint, public/private boundary check, and production build passed
• local clean-browser QA: /, /replay, /data, /results, /rl returned HTTP 200 with zero console errors

CI run: https://github.com/2233admin/Auto-Quant-V2/actions/runs/30763662418