refactor: Break apart monolithic configuration schema (#1977)

[skip ci]

src/config/schema/elements/custom/menu/base.ts

@@ -0,0 +1,15 @@
+import { z } from 'zod';
+import { MENU_PRIORITY_DEFAULT, MENU_PRIORITY_MAX } from '../../../common/const';
+
+export const menuBaseSchema = z.object({
+  enabled: z.boolean().default(true).optional(),
+  priority: z
+    .number()
+    .min(0)
+    .max(MENU_PRIORITY_MAX)
+    .default(MENU_PRIORITY_DEFAULT)
+    .optional(),
+  alignment: z.enum(['matching', 'opposing']).default('matching').optional(),
+  icon: z.string().optional(),
+  permanent: z.boolean().default(false).optional(),
+});