feat(tier): Erwerb/Kauf je Tier (Datum, Preis, Notiz)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

gerbil-manager-web/src/pages/GerbilDetailPage.tsx

@@ -10,6 +10,7 @@ import { ALL_TRAITS, TRAIT_CATEGORIES } from '../format/traits'
 import { fromDisplayString, genotypeToFarbschlag, displayGenotypeSafe } from '../genetics'
 import type { Gender, GerbilStatus } from '../api/types'
 import FarbschlagImage from '../components/FarbschlagImage'
+import GerbilAcquisitionSection from '../components/GerbilAcquisitionSection'
 import GerbilHealthTab from '../components/GerbilHealthTab'
 import GerbilPhotosTab from '../components/GerbilPhotosTab'
 import GerbilProfilePhoto from '../components/GerbilProfilePhoto'
@@ -336,6 +337,8 @@ export default function GerbilDetailPage() {
           </dl>
         </section>
 
+        <GerbilAcquisitionSection gerbilId={g.id} />
+
         <section className="ak-card">
           <h2 className="ak-h2">{t.detail.genetics}</h2>
           {geno ? (