SEO: Favicon 96x96, GameJam-Uploads noindex, og:image-Metadaten

- Favicon aus Emblem neu in 96x96 generiert (Google-SERP braucht min. 48x48),
  Favicon-Links versioniert
- /gamejam-games/: X-Robots-Tag noindex + robots.txt Disallow (Fremdcontent)
- og:image:width/height/alt auf Start, TechDay und GameJam

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

public/techday.html

@@ -15,6 +15,9 @@
 <meta property="og:title" content="TechDay Bruchsal 2026: ToolCTRL" />
 <meta property="og:description" content="ToolCTRL beim Bruchsaler TechDay 2026: Vortrag, AI GameJam und die mITapp. Am 27. Mai 2026 im HubWerk01 Bruchsal." />
 <meta property="og:image" content="https://tool-ctrl.de/assets/techday-event.png" />
+<meta property="og:image:width" content="683" />
+<meta property="og:image:height" content="384" />
+<meta property="og:image:alt" content="TechDay Bruchsal 2026 Eventmotiv" />
 <meta name="twitter:card" content="summary_large_image" />
 
 <!-- Structured Data -->
@@ -44,7 +47,7 @@
   }
 }
 </script>
-<link rel="icon" type="image/png" href="/assets/favicon.png" />
+<link rel="icon" type="image/png" href="/assets/favicon.png?v=20260610" />
 <link rel="stylesheet" href="/styles.css?v=20260610" />
 </head>
 <body>