chore(config): drop dead Netdata/code-server links and unused URL constants

Netdata was never deployed and code-server was decommissioned on
2026-07-19; their quick links pointed at dead domains. The
portainerUrl/netdataUrl constants had no consumers (quick links
hardcode their own URLs). The Portainer quick link stays — its
portainer.schweitz.net host arrives with the port-lockdown phase.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/features/front_hall/presentation/providers/quick_links_provider.dart

@@ -179,25 +179,7 @@ List<QuickLink> getDefaultQuickLinks() {
       type: QuickLinkType.iframe,
       sortOrder: 0,
     ),
-    const QuickLink(
-      id: 'cloud-ide',
-      name: 'Cloud IDE',
-      url: 'https://code.schweitz.net',
-      iconName: 'terminal',
-      category: 'Coding',
-      type: QuickLinkType.newTab,
-      sortOrder: 1,
-    ),
     // Infrastructure category
-    const QuickLink(
-      id: 'netdata',
-      name: 'Netdata',
-      url: 'https://netdata.schweitz.net',
-      iconName: 'monitoring',
-      category: 'Infrastructure',
-      type: QuickLinkType.iframe,
-      sortOrder: 0,
-    ),
     const QuickLink(
       id: 'portainer',
       name: 'Portainer',