feat: Implement admin backup export and import functionality

- Added new endpoints for exporting and importing instance-level backups.
- Introduced user interface components for backup management in the web app.
- Enhanced import/export logic to handle attachments and provide detailed summaries.
- Updated localization files to include new strings related to backup features.
- Improved styling for backup-related UI elements.

src/utils/user-decryption.ts

@@ -0,0 +1,63 @@
+import { User, UserDecryptionOptions } from '../types';
+
+export function buildAccountKeys(user: Pick<User, 'privateKey' | 'publicKey'>): Record<string, unknown> | null {
+  if (!user.privateKey || !user.publicKey) {
+    return null;
+  }
+
+  return {
+    publicKeyEncryptionKeyPair: {
+      wrappedPrivateKey: user.privateKey,
+      publicKey: user.publicKey,
+      Object: 'publicKeyEncryptionKeyPair',
+    },
+    Object: 'privateKeys',
+  };
+}
+
+export function buildMasterPasswordUnlock(
+  user: Pick<User, 'email' | 'key' | 'kdfType' | 'kdfIterations' | 'kdfMemory' | 'kdfParallelism'>
+): UserDecryptionOptions['MasterPasswordUnlock'] {
+  return {
+    Kdf: {
+      KdfType: user.kdfType,
+      Iterations: user.kdfIterations,
+      Memory: user.kdfMemory ?? null,
+      Parallelism: user.kdfParallelism ?? null,
+    },
+    MasterKeyEncryptedUserKey: user.key,
+    MasterKeyWrappedUserKey: user.key,
+    Salt: user.email.toLowerCase(),
+    Object: 'masterPasswordUnlock',
+  };
+}
+
+export function buildUserDecryptionOptions(
+  user: Pick<User, 'email' | 'key' | 'kdfType' | 'kdfIterations' | 'kdfMemory' | 'kdfParallelism'>
+): UserDecryptionOptions {
+  return {
+    HasMasterPassword: true,
+    Object: 'userDecryptionOptions',
+    MasterPasswordUnlock: buildMasterPasswordUnlock(user),
+    TrustedDeviceOption: null,
+    KeyConnectorOption: null,
+  };
+}
+
+export function buildUserDecryptionCompat(
+  user: Pick<User, 'email' | 'key' | 'kdfType' | 'kdfIterations' | 'kdfMemory' | 'kdfParallelism'>
+): Record<string, unknown> {
+  return {
+    masterPasswordUnlock: {
+      kdf: {
+        kdfType: user.kdfType,
+        iterations: user.kdfIterations,
+        memory: user.kdfMemory ?? null,
+        parallelism: user.kdfParallelism ?? null,
+      },
+      masterKeyWrappedUserKey: user.key,
+      masterKeyEncryptedUserKey: user.key,
+      salt: user.email.toLowerCase(),
+    },
+  };
+}