docs: update copilot-instructions.md for dashboard rewrite and ML upgrades
- Dashboard: FastAPI+React → FastAPI+Jinja2+htmx+Chart.js (2 route modules)
- Bot-detector: IsolationForest → triple-voice EIF+Autoencoder+XGBoost ensemble
- SQL schema: 10 → 13 files (added thesis features, perf indexes, views)
- Added ClickHouse 24.8 gotchas (projections, nested aggregates, let bindings)
- Added IPv4/IPv6 duality pattern, bot-detector test patterns
- Updated data retention table with 4 new thesis aggregation tables
- Fixed single-test commands to reference existing files
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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