feat(i18n): complete admin app internationalization across all pages

fix(audit): resolve 15 critical and major technical debt issues

feat: complete agentic audit roadmap — retry, KB generate, real costs, traceId, rate-limit

feat: agentic platform — text-to-sql, pedagogy advisor, security hardening & performance

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

feat: wire i18n to all remaining admin pages

fix: resolve chart dimension warnings and block default-org-id ghost calls

fix: resolve 401/400 errors by centralizing API client and injecting organizationId in backend

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

feat: Premium Onboarding with Meta SDK and Technical Debt resolution