enterprise: add social card meta tags to share pages

- Add og:image and twitter:image meta tags for better social sharing
- Generate dynamic social card URLs with session title, models, and version
- Include description meta tag for search engines

bun.lock

@@ -179,6 +179,7 @@
         "aws4fetch": "^1.0.20",
         "hono": "catalog:",
         "hono-openapi": "catalog:",
+        "js-base64": "3.7.7",
         "luxon": "catalog:",
         "nitro": "3.0.1-alpha.1",
         "solid-js": "catalog:",