Add site footer and fix proxy-aware viewer URLs.

Build public links from host_url netloc behind reverse proxies so generated viewer URLs do not include the internal upstream port.

Co-authored-by: Cursor <cursoragent@cursor.com>

static/style.css

@@ -601,6 +601,7 @@ tr:hover td { background: var(--bg-hover); }
 .landing-page {
   min-height: 100vh;
   display: flex;
+  flex-direction: column;
   align-items: center;
   justify-content: center;
   padding: 24px;
@@ -661,6 +662,35 @@ tr:hover td { background: var(--bg-hover); }
 
 .landing-lang { margin-top: 8px; }
 
+.site-footer {
+  text-align: center;
+  padding: 16px 24px 20px;
+  font-size: 0.78rem;
+  color: var(--text-muted);
+  border-top: 1px solid var(--border);
+}
+
+.site-footer p {
+  margin: 0;
+}
+
+.site-footer a {
+  color: var(--accent);
+  text-decoration: none;
+}
+
+.site-footer a:hover {
+  text-decoration: underline;
+}
+
+.landing-page .site-footer {
+  width: 100%;
+  max-width: 520px;
+  background: transparent;
+  border-top: none;
+  padding-top: 0;
+}
+
 /* Viewer link banner */
 .viewer-banner {
   display: flex;