feat(shared-uload): add password protection and expiration to ShareModal

Adds collapsible "Erweiterte Optionen" section with:
- Password protection toggle with text input
- Expiration date toggle with datetime-local picker
- Footer badges showing active protection/expiry on created links

Both fields are passed through to createShortLink and stored in IndexedDB.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/shared-uload/src/create-link.ts

@@ -88,6 +88,7 @@ export async function createShortLink(options: CreateShortLinkOptions): Promise<
 		order: 0,
 		source: options.source,
 		expiresAt: options.expiresAt || null,
+		password: options.password || null,
 		qrCodeUrl,
 	} as UloadLink);