fix(training): fix o.map crash on /training page

refactor(debt): resolve all 10 technical debt items from audit

feat: backlog P0→P3 — toast system, payments, tenant isolation, feedback handler, i18n parity

feat: wire i18n to all remaining admin pages

feat: migrate to multi-tenant SaaS architecture with JWT auth and BullMQ notifications

Refactor: Technical Debt Repayment (Clean Dashboard, Strict Typing, Pino Logging, SQL Migration)

feat: Genspark-Standard upgrade, MLOps audit fixes, and XAMLÉ branding

feat(admin): build Ground Truth Training Lab to calculate WER and capture dictionary improvements