feat: add about, contact with map, legal pages and 404

- About page with identity cards and equipment lists (about.json)
- Contact page: station info, obfuscated e-mail, lazy Leaflet/OSM map
  with antenna tower marker and dark-mode tiles
- Privacy, license and disclaimer pages from a legal collection
- QRT-themed 404 page
- LICENSE (MIT) and LICENSE-CONTENT (CC BY-SA 4.0 legal code)
- Shared PageHeader and CodeCopy components

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/lib/data.ts

@@ -8,6 +8,9 @@ import socialJson from '../data/social.json';
 import homeJson from '../data/home.json';
 import categoriesJson from '../data/categories.json';
 import blogJson from '../data/blog.json';
+import aboutJson from '../data/about.json';
+import contactJson from '../data/contact.json';
+import pagesJson from '../data/pages.json';
 
 const link = z.object({ label: z.string().min(1), href: z.string().min(1) });
 const icon = z.string().startsWith('tabler:');
@@ -180,6 +183,66 @@ const blogSchema = z.object({
   ),
 });
 
+const seo = z.object({ title: z.string().max(60), description: z.string().max(160) });
+
+const aboutSchema = z.object({
+  seo,
+  eyebrow: z.string(),
+  title: z.string(),
+  lead: z.string(),
+  identity: z.object({
+    title: z.string(),
+    items: z.array(z.object({ label: z.string(), value: z.string(), icon })),
+  }),
+  equipment: z.array(
+    z.object({
+      title: z.string(),
+      icon,
+      items: z.array(z.object({ name: z.string(), note: z.string().optional() })).min(1),
+    }),
+  ),
+});
+
+const contactSchema = z.object({
+  seo,
+  eyebrow: z.string(),
+  title: z.string(),
+  icon,
+  lead: z.string(),
+  infoTitle: z.string(),
+  map: z.object({
+    title: z.string(),
+    lat: z.number().min(-90).max(90),
+    lng: z.number().min(-180).max(180),
+    zoom: z.number().int().min(1).max(19),
+    popup: z.string(),
+    ariaLabel: z.string(),
+    note: z.string(),
+    loading: z.string(),
+  }),
+  items: z.array(
+    z.object({
+      label: z.string(),
+      icon,
+      values: z.array(z.string()).optional(),
+      href: z.url().optional(),
+      email: z.email().optional(),
+    }),
+  ),
+});
+
+const pagesSchema = z.object({
+  legal: strings(['eyebrow', 'updated', 'notice']),
+  notFound: z.object({
+    seoTitle: z.string(),
+    description: z.string(),
+    eyebrow: z.string(),
+    title: z.string(),
+    lead: z.string(),
+    links: z.array(link.extend({ variant: z.enum(['primary', 'secondary', 'link']), icon })),
+  }),
+});
+
 function parse<T>(name: string, schema: z.ZodType<T>, data: unknown): T {
   const result = schema.safeParse(data);
   if (!result.success) {
@@ -192,6 +255,9 @@ export const site = parse('site.json', siteSchema, siteJson);
 export const home = parse('home.json', homeSchema, homeJson);
 export const categories = parse('categories.json', categoriesSchema, categoriesJson);
 export const blog = parse('blog.json', blogSchema, blogJson);
+export const about = parse('about.json', aboutSchema, aboutJson);
+export const contact = parse('contact.json', contactSchema, contactJson);
+export const pages = parse('pages.json', pagesSchema, pagesJson);
 export const social = parse('social.json', socialSchema, socialJson).filter((s) => s.href);
 
 export type Site = z.infer<typeof siteSchema>;