feat(company-explorer): bump version to 0.3.0, add VAT ID extraction, and fix deep-link scraping

- Updated version to v0.3.0 (UI & Backend) to clear potential caching confusion.
- Enhanced Impressum scraper to extract VAT ID (Umsatzsteuer-ID).
- Implemented 2-Hop scraping strategy: Looks for 'Kontakt' page if Impressum isn't on the start page.
- Added VAT ID display to the Legal Data block in Inspector.

company-explorer/frontend/src/App.tsx

@@ -73,7 +73,7 @@ function App() {
             </div>
             <div>
               <h1 className="text-xl font-bold text-white tracking-tight">Company Explorer</h1>
-              <p className="text-xs text-blue-400 font-medium">ROBOTICS EDITION <span className="text-slate-600 ml-2">v0.2.2 (New DB Path)</span></p>
+              <p className="text-xs text-blue-400 font-medium">ROBOTICS EDITION <span className="text-slate-600 ml-2">v0.3.0 (Polling & Legal Data)</span></p>
             </div>
           </div>