Add /api/info endpoint for build time, title.js, UI tweaks

wwwroot/js/title.js

@@ -0,0 +1,18 @@
+let buildTime = 0;
+
+fetch('/api/info').then(r => r.json()).then(data => {
+  buildTime = data.buildTime || 0;
+  updateTitle();
+  setInterval(updateTitle, 1000);
+});
+
+function updateTitle() {
+  if (!buildTime) { document.title = '// gott'; return; }
+  const s = Math.floor(Date.now() / 1000) - buildTime;
+  let ago;
+  if (s < 60) ago = `${s} Sekunde${s !== 1 ? 'n' : ''}`;
+  else if (s < 3600) { const m = Math.floor(s / 60); ago = `${m} Minute${m !== 1 ? 'n' : ''}`; }
+  else if (s < 86400) { const h = Math.floor(s / 3600); ago = `${h} Stunde${h !== 1 ? 'n' : ''}`; }
+  else { const d = Math.floor(s / 86400); ago = `${d} Tag${d !== 1 ? 'en' : ''}`; }
+  document.title = `// gott :: Build vor ${ago}`;
+}