feat: add master password hint functionality

- Updated user model to include masterPasswordHint.
- Modified sync handler to return masterPasswordHint.
- Implemented password hint retrieval in public API.
- Enhanced user profile management to allow updating of password hint.
- Added UI components for displaying and editing password hint.
- Updated localization files for new password hint strings.
- Improved rate limiting for sensitive public requests.
- Adjusted database schema to accommodate master password hint.

webapp/src/components/AppMainRoutes.tsx

@@ -77,6 +77,7 @@ export interface AppMainRoutesProps {
   uploadingSendFileName: string;
   sendUploadPercent: number | null;
   onChangePassword: (currentPassword: string, nextPassword: string, nextPassword2: string) => Promise<void>;
+  onSavePasswordHint: (masterPasswordHint: string) => Promise<void>;
   onEnableTotp: (secret: string, token: string) => Promise<void>;
   onOpenDisableTotp: () => void;
   onGetRecoveryCode: (masterPassword: string) => Promise<string>;
@@ -198,6 +199,7 @@ export default function AppMainRoutes(props: AppMainRoutesProps) {
                 profile={props.profile}
                 totpEnabled={props.totpEnabled}
                 onChangePassword={props.onChangePassword}
+                onSavePasswordHint={props.onSavePasswordHint}
                 onEnableTotp={props.onEnableTotp}
                 onOpenDisableTotp={props.onOpenDisableTotp}
                 onGetRecoveryCode={props.onGetRecoveryCode}