SEO + UX: schema.org JSON-LD, sitemap fix, persistent topbar, POST-only rate limit

- Add schema.org JSON-LD to page, service, and location templates (LocalBusiness / Service / FAQPage)
- Inject schema_json via _header.php <script type="application/ld+json"> block
- Fix sitemap.xml: replace 10 stale .html refs with trailing-slash URLs, add /blog/, update lastmod
- nginx: rate-limit /contact/ POST-only via map $request_method (GET no longer hits 429)
- Topbar: remove dismiss button, always visible for session; popup close no longer hides topbar

Verified: all 17 routes 200, JSON-LD present on home/service/location/contact, sitemap 17 URLs no .html

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/api/templates/location.php

@@ -22,6 +22,25 @@ $body       = json_decode($loc['body_json'] ?? '{}', true) ?? [];
 $faqs       = json_decode($loc['faqs_json'] ?? '[]', true) ?? [];
 $city       = $loc['city'];
 
+$schema_json = json_encode([
+    '@context' => 'https://schema.org',
+    '@type'    => 'HomeAndConstructionBusiness',
+    'name'     => 'Floor It Hardwood Floors',
+    'url'      => 'https://floorithardwoodfloors.com',
+    'telephone'=> '+17166021429',
+    'address'  => [
+        '@type'           => 'PostalAddress',
+        'addressLocality' => $loc['city'],
+        'addressRegion'   => 'NY',
+        'addressCountry'  => 'US',
+    ],
+    'areaServed' => [
+        '@type' => 'City',
+        'name'  => $loc['city'],
+    ],
+    'description' => $loc['meta_description'],
+], JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+
 require __DIR__ . '/../components/_header.php';
 ?>