feat: public review flow for posts (like artefacts)

- Token-based public review page at /review-post/:token
- Submit for Review button generates shareable link
- External reviewers can approve/reject with comments
- Approval gate prevents skipping review (superadmin override)
- i18n keys for review flow in en + ar

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/src/App.jsx

@@ -31,6 +31,7 @@ const Login = lazy(() => import('./pages/Login'))
 const Artefacts = lazy(() => import('./pages/Artefacts'))
 const PostCalendar = lazy(() => import('./pages/PostCalendar'))
 const PublicReview = lazy(() => import('./pages/PublicReview'))
+const PublicPostReview = lazy(() => import('./pages/PublicPostReview'))
 const Issues = lazy(() => import('./pages/Issues'))
 const PublicIssueSubmit = lazy(() => import('./pages/PublicIssueSubmit'))
 const PublicIssueTracker = lazy(() => import('./pages/PublicIssueTracker'))
@@ -291,6 +292,7 @@ function AppContent() {
             <Route path="/forgot-password" element={user ? <Navigate to="/" replace /> : <ForgotPassword />} />
             <Route path="/reset-password" element={user ? <Navigate to="/" replace /> : <ResetPassword />} />
             <Route path="/review/:token" element={<PublicReview />} />
+            <Route path="/review-post/:token" element={<PublicPostReview />} />
             <Route path="/submit-issue" element={<PublicIssueSubmit />} />
             <Route path="/track/:token" element={<PublicIssueTracker />} />
             <Route path="/" element={user ? <Layout /> : <Navigate to="/login" replace />}>