test(web): add middleware + i18n + messages test suites (GOO-60)

Cover frontend middleware auth/locale logic, i18n config/routing/request/navigation,
and vi/en message parity — 91 new tests across 6 files.

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

turbo.json

@@ -15,6 +15,10 @@
     "test": {
       "dependsOn": ["^build"]
     },
+    "test:coverage": {
+      "dependsOn": ["^build"],
+      "outputs": ["coverage/**"]
+    },
     "typecheck": {
       "dependsOn": ["^build"]
     }