Add Mega-Debrid account info check (web scraping)

Scrapes the Mega-Debrid profile page to display username, premium status,
remaining days, and loyalty points. New "Account prüfen" button in Settings > Accounts.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main/app-controller.ts

@@ -7,6 +7,7 @@ import {
   DuplicatePolicy,
   HistoryEntry,
   ParsedPackageInput,
+  ProviderAccountInfo,
   SessionStats,
   StartConflictEntry,
   StartConflictResolutionResult,
@@ -327,6 +328,10 @@ export class AppController {
     removeHistoryEntry(this.storagePaths, entryId);
   }
 
+  public async checkMegaAccount(): Promise<ProviderAccountInfo> {
+    return this.megaWebFallback.getAccountInfo();
+  }
+
   public addToHistory(entry: HistoryEntry): void {
     addHistoryEntry(this.storagePaths, entry);
   }