feat: Add IndexNow submission and sitemap updates

- Add IndexNow submit script + state tracking
- Update deploy script to notify IndexNow after healthy deploy
- Publish IndexNow verification file in public
- Update sitemaps and add env placeholders
- Pass analytics/ads/IndexNow env vars into frontend build

frontend/scripts/submit-indexnow.test.mjs

@@ -0,0 +1,40 @@
+import { describe, expect, it } from 'vitest';
+
+import {
+  diffUrlLists,
+  extractLocs,
+  normalizeEndpoint,
+  normalizeOrigin,
+} from './submit-indexnow.mjs';
+
+describe('submit-indexnow helpers', () => {
+  it('normalizes endpoints to the /indexnow path', () => {
+    expect(normalizeEndpoint('https://www.bing.com')).toBe('https://www.bing.com/indexnow');
+    expect(normalizeEndpoint('https://www.bing.com/indexnow')).toBe('https://www.bing.com/indexnow');
+  });
+
+  it('normalizes origins without a trailing slash', () => {
+    expect(normalizeOrigin('https://dociva.io/').toString()).toBe('https://dociva.io/');
+  });
+
+  it('extracts loc entries from sitemap xml', () => {
+    const xml = `<?xml version="1.0" encoding="UTF-8"?>\n<urlset>\n  <url><loc>https://dociva.io/a</loc></url>\n  <url><loc>https://dociva.io/b</loc></url>\n</urlset>`;
+    expect(extractLocs(xml)).toEqual(['https://dociva.io/a', 'https://dociva.io/b']);
+  });
+
+  it('returns the full set on the first submission', () => {
+    expect(diffUrlLists(['https://dociva.io/a', 'https://dociva.io/b'], [])).toEqual([
+      'https://dociva.io/a',
+      'https://dociva.io/b',
+    ]);
+  });
+
+  it('returns only added and removed urls after the first submission', () => {
+    expect(
+      diffUrlLists(
+        ['https://dociva.io/a', 'https://dociva.io/c'],
+        ['https://dociva.io/a', 'https://dociva.io/b'],
+      ),
+    ).toEqual(['https://dociva.io/b', 'https://dociva.io/c']);
+  });
+});