merge: resolve conflicts with dev, fix 7 Snyk security issues

- Resolve translation conflicts (keep both journey + OAuth scope keys)
- Resolve migrations.ts (dev OAuth migrations + journey migrations)
- Fix hono directory traversal, response splitting, input validation (CVE-2026-39407/08/09/10)
- Fix @hono/node-server directory traversal (CVE-2026-39406)
- Fix nodemailer CRLF injection (upgrade to 8.0.5)

client/src/App.tsx

@@ -15,6 +15,7 @@ import JourneyDetailPage from './pages/JourneyDetailPage'
 import JourneyPublicPage from './pages/JourneyPublicPage'
 import SharedTripPage from './pages/SharedTripPage'
 import InAppNotificationsPage from './pages/InAppNotificationsPage.tsx'
+import OAuthAuthorizePage from './pages/OAuthAuthorizePage'
 import { ToastContainer } from './components/shared/Toast'
 import BottomNav from './components/Layout/BottomNav'
 import { TranslationProvider, useTranslation } from './i18n'
@@ -173,6 +174,8 @@ export default function App() {
         <Route path="/shared/:token" element={<SharedTripPage />} />
         <Route path="/public/journey/:token" element={<JourneyPublicPage />} />
         <Route path="/register" element={<LoginPage />} />
+        {/* OAuth 2.1 consent page — intentionally outside ProtectedRoute */}
+        <Route path="/oauth/authorize" element={<OAuthAuthorizePage />} />
         <Route
           path="/dashboard"
           element={