feat: implement vault synchronization and decryption improvements

- Added background synchronization for vault core data, including optional folder updates.
- Introduced a new API endpoint to retrieve the vault revision date.
- Enhanced vault synchronization logic to utilize a caching mechanism for improved performance.
- Created a new vault cache module to handle IndexedDB storage for vault core snapshots.
- Implemented a worker for asynchronous decryption of vault data, improving UI responsiveness.
- Updated main application settings to adjust query stale time for better data freshness.
- Refactored vault-related API functions to support cache keys for more efficient data retrieval.

webapp/src/main.tsx

@@ -9,6 +9,7 @@ const queryClient = new QueryClient({
     queries: {
       retry: 1,
       refetchOnWindowFocus: false,
+      staleTime: 30_000,
     },
   },
 });