feat: use app-level svgIconKey for app logos and improve tile contrast

- Add svgIconKey field to RemnawaveAppClient and RemnawaveApp types
- Render app logos from svgLibrary via app.svgIconKey on connection page
  chips with fallback to getAppIcon() by name
- Use app.svgIconKey for app icons on admin apps settings page
- Show featured indicator as amber dot matching original RemnaWave UI
- Increase inner tile background opacity from 30% to 50% on subscription
  page for better text readability

src/api/adminApps.ts

@@ -113,6 +113,7 @@ export interface RemnawaveApp {
   featured?: boolean;
   urlScheme?: string;
   isNeedBase64Encoding?: boolean;
+  svgIconKey?: string;
   blocks: RemnawaveBlock[];
 }