feat: implement version display with commit hash and date

frontend/src/components/Layout/AppLayout.vue

@@ -167,6 +167,16 @@
             {{ userInitials }}
           </div>
         </div>
+
+        <!-- Версия сборки (всегда внизу) -->
+        <div v-if="!sidebarCollapsed" class="px-4 py-3 border-t border-gray-200 text-xs text-gray-500">
+          {{ versionStore.getFormattedVersion(t) }}
+        </div>
+        <div v-else class="p-2 border-t border-gray-200 flex justify-center">
+          <div class="text-xs text-gray-500 font-mono" :title="versionStore.getFormattedVersion(t)">
+            {{ versionStore.version?.commitHash?.slice(0, 6) }}
+          </div>
+        </div>
       </div>
     </aside>
 
@@ -256,9 +266,11 @@ import { useSettingsStore } from '@/stores/settings'
 import { useUserStore } from '@/stores/user'
 import { useI18n } from 'vue-i18n'
 import { useNotification } from '@/composables/useNotification'
+import { useVersionStore } from '@/stores/version'
 
 const { notification, showNotification } = useNotification()
 const settings = useSettingsStore()
+const versionStore = useVersionStore()
 const userStore = useUserStore()
 const route = useRoute()
 const router = useRouter()