feat(navigation): add Header entity + use-case + mock/payload repos + DI container

packages/navigation/src/entities/header.ts

@@ -0,0 +1,15 @@
+import { z } from "zod";
+
+export const headerItemSchema = z.object({
+  label: z.string().min(1).max(64),
+  href: z.string().min(1),
+  external: z.boolean().default(false),
+});
+
+export const headerSchema = z.object({
+  logoId: z.string().optional(),
+  items: z.array(headerItemSchema),
+});
+
+export type Header = z.infer<typeof headerSchema>;
+export type HeaderItem = z.infer<typeof headerItemSchema>;