chore: apply cargo fmt across workspace and update docs

- Run cargo fmt on all Rust crates for consistent formatting
- Update CLAUDE.md with WASM plugin commands and dev.ps1 instructions
- Update wiki: add WASM plugin architecture, rewrite dev environment docs
- Minor frontend cleanup (unused imports)

apps/web/src/pages/settings/MenuConfig.tsx

@@ -45,29 +45,6 @@ function flattenMenuTree(tree: MenuItem[]): MenuItem[] {
   return result;
 }
 
-/** Convert flat menu list to tree structure for Table children prop */
-function buildMenuTree(items: MenuItem[]): MenuItem[] {
-  const map = new Map<string, MenuItem>();
-  const roots: MenuItem[] = [];
-
-  const withChildren = items.map((item) => ({
-    ...item,
-    children: [] as MenuItem[],
-  }));
-
-  withChildren.forEach((item) => map.set(item.id, item));
-
-  withChildren.forEach((item) => {
-    if (item.parent_id && map.has(item.parent_id)) {
-      map.get(item.parent_id)!.children!.push(item);
-    } else {
-      roots.push(item);
-    }
-  });
-
-  return roots;
-}
-
 /** Convert menu tree to TreeSelect data nodes */
 function toTreeSelectData(
   items: MenuItem[],
@@ -91,7 +68,7 @@ const menuTypeLabels: Record<string, { text: string; color: string }> = {
 // --- Component ---
 
 export default function MenuConfig() {
-  const [menus, setMenus] = useState<MenuItem[]>([]);
+  const [_menus, setMenus] = useState<MenuItem[]>([]);
   const [menuTree, setMenuTree] = useState<MenuItem[]>([]);
   const [loading, setLoading] = useState(false);
   const [modalOpen, setModalOpen] = useState(false);