Update package-lock.json and enhance admin and ads landing HTML
- Removed unused @cloudflare/workers-types from package-lock.json.
- Updated miniflare and wrangler versions in package-lock.json for improved compatibility.
- Refactored ad item handling in admin-html.ts to normalize data and provide default values for missing fields.
- Added new CSS styles and specifications for ad formats in ads-landing-html.ts to improve layout and clarity.