Improve SEO and agentic browsing for public pages (#18).

Add per-page titles/meta/Open Graph, semantic landmarks, robots/sitemap/llms.txt, and accessibility fixes so humans and agents can discover and navigate the site reliably.

schasite/static/css/style2.css

@@ -10,9 +10,28 @@ section {
     scroll-margin-top: 70px;
 }
 
+/* Skip link visible when focused */
+.visually-hidden-focusable:focus {
+    z-index: 1080;
+}
+
+/* Reserve image space to reduce CLS */
+.card-img-top {
+    aspect-ratio: 16 / 9;
+    object-fit: cover;
+    width: 100%;
+    height: auto;
+}
+
+img.img-fluid {
+    max-width: 100%;
+    height: auto;
+}
+
 /* Hero Section */
 #home {
     background-color: rgba(var(--bs-success-rgb), 0.1);
+    min-height: 280px;
 }
 
 /* News and Contact Sections */
@@ -43,4 +62,4 @@ section {
 .was-validated .form-control:valid,
 .form-control.is-valid {
     border-color: #198754;
-}
+}