feat(dashboards): migrate admin + tracker dashboards to common-plat as product-agnostic
- Copy admin-dashboard-web → dashboards/admin-web
- Copy tracker-dashboard-web → dashboards/tracker-web
- Update pnpm-workspace.yaml to include dashboards/*
- Replace file: refs with workspace:* for @bytelyst/* packages
- Replace all hardcoded LysnrAI/lysnn.com branding with generic platform refs
- Make telemetry use NEXT_PUBLIC_PRODUCT_ID / PRODUCT_ID env vars
- Update mock credentials, seed data, invitation codes, placeholders
- Update READMEs, e2e tests, unit tests for product-agnostic content
- Both dashboards pass tsc --noEmit clean
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