feat: add shared API utilities for handling requests and responses

- Introduced `shared.ts` with utility functions for API interactions, including JSON parsing, error handling, and content disposition parsing.
- Added `vault.ts` to manage vault-related operations such as folder and cipher management, including creation, deletion, and bulk operations.
- Implemented encryption and decryption methods for secure data handling within the vault.
- Created `backup-settings-repair.ts` to automatically repair backup settings for admin profiles if needed.

webapp/src/lib/backup-settings-repair.ts

@@ -0,0 +1,22 @@
+import { createAuthedFetch } from './api/auth';
+import { getAdminBackupSettingsRepairState, repairAdminBackupSettings } from './api/backup';
+import { decryptPortableBackupSettings } from './admin-backup-portable';
+import type { Profile, SessionState } from './types';
+
+export async function silentlyRepairBackupSettingsIfNeeded(
+  activeSession: SessionState,
+  activeProfile: Profile
+): Promise<void> {
+  if (activeProfile.role !== 'admin') return;
+  if (!activeSession.accessToken || !activeSession.symEncKey || !activeSession.symMacKey) return;
+
+  const tempFetch = createAuthedFetch(() => activeSession, () => {});
+  try {
+    const state = await getAdminBackupSettingsRepairState(tempFetch);
+    if (!state.needsRepair || !state.portable) return;
+    const repairedSettings = await decryptPortableBackupSettings(state.portable, activeProfile, activeSession);
+    await repairAdminBackupSettings(tempFetch, repairedSettings);
+  } catch (error) {
+    console.error('Backup settings auto-repair failed:', error);
+  }
+}