✨ feat(bestdebrid): add BestDebrid web-login provider

- New BestDebrid web-login option (BrowserWindow + session.fetch)
- Uses bestdebrid.com/api/v1/generateLink with browser session cookies
- Login via BestDebrid website in embedded browser window
- Toggle "BestDebrid per Web-Login statt API-Token verwenden"
- Provider label shows "BestDebrid (Web)" or "BestDebrid (API)"
- Session persistence respects "Token merken" setting

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

src/main/storage.ts

@@ -112,6 +112,7 @@ export function normalizeSettings(settings: AppSettings): AppSettings {
     megaPassword: asText(settings.megaPassword),
     megaDebridPreferApi: settings.megaDebridPreferApi !== undefined ? Boolean(settings.megaDebridPreferApi) : true,
     bestToken: asText(settings.bestToken),
+    bestDebridUseWebLogin: Boolean(settings.bestDebridUseWebLogin),
     allDebridToken: asText(settings.allDebridToken),
     allDebridUseWebLogin: Boolean(settings.allDebridUseWebLogin),
     ddownloadLogin: asText(settings.ddownloadLogin),
@@ -207,6 +208,7 @@ function sanitizeCredentialPersistence(settings: AppSettings): AppSettings {
     megaLogin: "",
     megaPassword: "",
     bestToken: "",
+    bestDebridUseWebLogin: settings.bestDebridUseWebLogin,
     allDebridToken: "",
     ddownloadLogin: "",
     ddownloadPassword: "",