slskd: /soulseek search + downloads on the Workspace/Panel framework

Two panels (search + transfers) via WorkspaceView, coordinating over the
soulseek:refresh channel. Adds the page-title rule and documents the
route conventions in CLAUDE.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/apps/officer-web/Screens/Dashboard/Soulseek/defaultLayout.ts

@@ -0,0 +1,11 @@
+import type { LayoutNode } from 'officerdev';
+
+export const defaultLayout: LayoutNode = {
+  type: 'group',
+  id: 'soulseek-root',
+  direction: 'horizontal',
+  children: [
+    { node: { type: 'panel', id: 'soulseek-search', appType: 'soulseek-search' }, size: 55 },
+    { node: { type: 'panel', id: 'soulseek-transfers', appType: 'soulseek-transfers' }, size: 45 },
+  ],
+};