fix(andreknie.de): normalize SEO metadata and document structure

privat/CV/andreknie.de/src/pages/About.jsx

@@ -2,6 +2,7 @@ import React from 'react'
 import { useMeta } from '../hooks/useContent'
 import { ExternalLink, Globe } from 'lucide-react'
 import SpeakerCvRequest from '../components/SpeakerCvRequest'
+import SEOHead from '../components/SEOHead'
 
 export default function About() {
   const { profile, about } = useMeta()
@@ -12,6 +13,7 @@ export default function About() {
 
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+      <SEOHead title="Über mich" description="Über Dr. André Knie, seine Arbeit, Stationen und Perspektive auf KI und digitale Souveränität." url="/ueber-mich" />
       <div className="app-container" style={{ maxWidth: '800px' }}>
         <div className="section-header">
           <h1 className="section-title">Über <span className="text-gradient">mich</span></h1>