feat: add SEO metadata, llms.txt, and markdown page mirrors

Centralize site metadata and social URLs for JSON-LD, expose llmstxt.org
content and per-page .md routes for LLM crawlers, and refactor blog/FAQ/events
pages with shared components.

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

frontend/app/terms/page.tsx

@@ -2,6 +2,7 @@ import type { Metadata } from "next";
 import Link from "next/link";
 import { Navbar } from "@/components/public/Navbar";
 import { Footer } from "@/components/public/Footer";
+import { BreadcrumbJsonLd } from "@/components/public/JsonLd";
 
 export const metadata: Metadata = {
   title: "Terms of Use",
@@ -18,6 +19,12 @@ export const metadata: Metadata = {
 export default function TermsPage() {
   return (
     <>
+      <BreadcrumbJsonLd
+        items={[
+          { name: "Home", href: "/" },
+          { name: "Terms of Use", href: "/terms" },
+        ]}
+      />
       <Navbar />
       <div className="min-h-screen">
         <div className="max-w-3xl mx-auto px-8 pt-16 pb-24">