docs(todo): add i18n milestones and test coverage tasks

TODO.md

@@ -21,6 +21,9 @@ This file is the single source of truth for roadmap and delivery progress.
 - [x] [P1] RBAC domain model finalized (roles, permissions, resource scopes)
 - [x] [P1] RBAC enforcement at route and action level in admin
 - [x] [P1] Permission matrix documented and tested
+- [ ] [P1] i18n baseline architecture (default locale, supported locales, routing strategy)
+- [ ] [P1] i18n runtime integration baseline for both apps (locale provider + message loading)
+- [ ] [P1] Locale persistence and switcher base component (cookie/header + UI)
 - [ ] [P1] Integrate Better Auth core configuration and session wiring
 - [ ] [P1] Bootstrap first-run owner account creation when users table is empty
 - [ ] [P1] Enforce invariant: exactly one owner user must always exist
@@ -45,6 +48,7 @@ This file is the single source of truth for roadmap and delivery progress.
 - [x] [P1] Separate Next.js public app in monorepo
 - [x] [P1] App Router + TypeScript + `src/` structure
 - [~] [P1] Public app connected to shared data layer
+- [ ] [P1] Localized route structure and middleware rules
 - [ ] [P2] Public layout system (header/footer/navigation)
 - [ ] [P1] Header banner rendering from CMS-managed content
 - [ ] [P2] Basic SEO defaults (metadata, OG, sitemap, robots)
@@ -56,12 +60,16 @@ This file is the single source of truth for roadmap and delivery progress.
 - [ ] [P1] CI workflow for lint/typecheck/unit/e2e gates
 - [ ] [P1] Test data strategy (seed fixtures + isolated e2e data)
 - [~] [P1] RBAC policy unit tests and permission regression suite
+- [ ] [P1] i18n unit tests (locale resolution, fallback, message key loading)
+- [ ] [P1] i18n integration tests (admin/public locale switch and persistence)
+- [ ] [P1] i18n e2e smoke tests (localized headings/content per route)
 - [ ] [P1] CRUD contract tests for shared service patterns
 
 ### Documentation
 
 - [x] [P1] Docs tool baseline added (`docs/` via VitePress)
 - [x] [P1] RBAC and permission model documentation in docs site
+- [ ] [P2] i18n conventions docs (keys, namespaces, fallback, translation workflow)
 - [ ] [P1] CRUD base patterns documentation and examples
 - [ ] [P1] Environment and deployment runbook docs (dev/staging/production)
 - [ ] [P2] API and domain glossary pages
@@ -108,6 +116,7 @@ This file is the single source of truth for roadmap and delivery progress.
 - [ ] [P1] Dynamic page rendering from CMS page entities
 - [ ] [P1] Navigation rendering from managed menu structure
 - [ ] [P1] Media entity rendering with enrichment data
+- [ ] [P1] Translation-ready content model for public entities (pages/news/navigation labels)
 - [ ] [P2] Artwork views and listing filters
 - [ ] [P1] Commission request submission flow
 - [ ] [P1] Header banner render logic and fallbacks
@@ -125,6 +134,7 @@ This file is the single source of truth for roadmap and delivery progress.
 - [ ] [P1] Component tests for admin forms (pages/media/navigation)
 - [ ] [P1] Integration tests for owner invariant and hidden support-user protection
 - [ ] [P1] Integration tests for registration allow/deny behavior
+- [ ] [P1] Integration tests for translated content CRUD and locale-specific validation
 - [ ] [P1] E2E happy paths: create page, publish, see on public app
 - [ ] [P1] E2E happy paths: media upload + artwork refinement display
 - [ ] [P1] E2E happy paths: commissions kanban transitions
@@ -139,6 +149,7 @@ This file is the single source of truth for roadmap and delivery progress.
 - [ ] [P1] Verify email pipeline and operational templates (welcome/verify/resend)
 - [ ] [P1] Forgot password/reset password pipeline and support tooling
 - [ ] [P2] GUI page to edit role-permission mappings with safety guardrails
+- [ ] [P2] Translation management UI for admin (language toggles, key coverage, missing translation markers)
 - [ ] [P2] Error boundaries and UX fallback states
 
 ### Public App
@@ -162,6 +173,7 @@ This file is the single source of truth for roadmap and delivery progress.
 - [ ] [P2] Load/perf tests for key public routes
 - [ ] [P2] Flake tracking and quarantine policy for e2e
 - [ ] [P1] Coverage thresholds and enforcement policy
+- [ ] [P1] Locale matrix regression suite for critical user journeys
 
 ## Discovery Log