feat: Rennmausakte, Zucht-Suffix, Gehege-Bilder, Toasts, Infinite-Scroll

Detailseite (Rennmausakte):
- Neugestaltung: Hero-Foto + Overlay, Schnellfakten-Pills, Karten-Sektionen,
  Charakter als Chips, getabte Fotos/Gesundheit/Gewicht.
- Eltern (Vater/Mutter) als Links; Charakter-Karte klappt bei Status
  Abgabe/Verstorben/Abgegeben ein (nur Zucht/Liebhaber offen).
- Gehege wird bei abgegebenen/verstorbenen Tieren ausgeblendet (Detail + Formular).

Listen:
- Infinite Scroll auf allen Listen (Rennmäuse, Würfe, Gehege, Verträge,
  Anfragen, Kontakte) via useInfiniteList/useInfiniteSentinel; stabile
  Sortierung mit id-Tiebreaker (keine doppelten Keys), Back-to-top-Button.
- Kontakte: Rolle-Filter (Züchter/Abnehmer) als Quick-Chips + Sticky-Header.

Zucht-Nachname:
- Namens-Anhängsel der Zucht in den Einstellungen + je Züchter-Kontakt
  (Backend-Spalten + Migration); eigene Tiere zeigen „Name + Suffix".
- „Eigene Zucht" ist die Standard-Herkunft neuer Tiere.

Weiteres:
- Gehege-Bilder: Upload/Galerie auf der Gehege-Detailseite (Backend
  EnclosurePhoto + Endpoints + Migration, geteilte Dateiablage).
- Toast-Rückmeldungen für alle Speichern-Aktionen.
- Checkboxen durch mobile-freundliche Toggle-Schalter ersetzt.

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

gerbil-manager-web/src/components/EnclosurePhotosSection.tsx

@@ -0,0 +1,116 @@
+/** Bilder eines Gehges — Galerie-Raster + Upload + Löschen (wie der Tier-Fotos-Tab). */
+import { useRef, useState, type FormEvent } from 'react'
+import { de } from '../strings/de'
+import {
+  deleteEnclosurePhoto,
+  listEnclosurePhotos,
+  photoSrc,
+  uploadEnclosurePhoto,
+} from '../api/enclosurePhotos'
+import { useApi, useMutation } from '../hooks/useApi'
+import { useToast } from './toast'
+
+export default function EnclosurePhotosSection({ enclosureId }: { enclosureId: string }) {
+  const tp = de.pages.tierTabs.photos
+  const toast = useToast()
+
+  const photos = useApi(() => listEnclosurePhotos(enclosureId), [enclosureId])
+  const fileInput = useRef<HTMLInputElement>(null)
+  const [caption, setCaption] = useState('')
+  const [fileError, setFileError] = useState<string | null>(null)
+
+  const upload = useMutation((file: File) =>
+    uploadEnclosurePhoto(enclosureId, file, caption.trim() === '' ? null : caption.trim()),
+  )
+  const removal = useMutation((photoId: string) => deleteEnclosurePhoto(photoId))
+
+  async function onUpload(e: FormEvent) {
+    e.preventDefault()
+    const file = fileInput.current?.files?.[0]
+    if (!file) {
+      setFileError(tp.validation.fileRequired)
+      return
+    }
+    setFileError(null)
+    const r = await upload.run(file)
+    if (r.ok) {
+      toast.success(de.common.saved)
+      setCaption('')
+      if (fileInput.current) fileInput.current.value = ''
+      photos.reload()
+    } else {
+      toast.error(r.error)
+    }
+  }
+
+  async function onDelete(photoId: string) {
+    if (!window.confirm(tp.deleteConfirm)) return
+    const r = await removal.run(photoId)
+    if (r.ok) {
+      toast.success(de.common.deleted)
+      photos.reload()
+    } else {
+      toast.error(r.error)
+    }
+  }
+
+  const items = photos.data ?? []
+
+  return (
+    <div>
+      <form className="form" onSubmit={onUpload} noValidate>
+        <label className="field">
+          <span>{tp.chooseFile}</span>
+          <input ref={fileInput} type="file" accept="image/*" className="input" />
+          {fileError && <small className="error-text">{fileError}</small>}
+        </label>
+        <label className="field">
+          <span>{tp.captionLabel}</span>
+          <input className="input" value={caption} onChange={(e) => setCaption(e.target.value)} />
+        </label>
+        {upload.error && <div className="alert alert--error">{upload.error}</div>}
+        <div className="form-actions">
+          <button type="submit" className="btn btn--primary" disabled={upload.pending}>
+            {upload.pending ? tp.uploading : tp.uploadButton}
+          </button>
+        </div>
+      </form>
+
+      {photos.loading && <p className="muted">{de.common.loading}</p>}
+      {photos.error && (
+        <div className="alert alert--error">
+          <span>{photos.error}</span>
+          <button type="button" className="btn" onClick={photos.reload}>
+            {de.common.retry}
+          </button>
+        </div>
+      )}
+      {removal.error && <div className="alert alert--error">{removal.error}</div>}
+
+      {!photos.loading && !photos.error && items.length === 0 && <p className="muted">{tp.empty}</p>}
+
+      {items.length > 0 && (
+        <ul className="photo-grid">
+          {[...items]
+            .sort((a, b) => a.sortOrder - b.sortOrder)
+            .map((p) => (
+              <li key={p.id} className="photo-card">
+                <img src={photoSrc(p)} alt={p.caption ?? p.fileName} loading="lazy" />
+                <div className="photo-card__bar">
+                  <span className="photo-card__caption">{p.caption ?? ''}</span>
+                  <button
+                    type="button"
+                    className="btn btn--danger"
+                    onClick={() => onDelete(p.id)}
+                    disabled={removal.pending}
+                  >
+                    {de.common.delete}
+                  </button>
+                </div>
+              </li>
+            ))}
+        </ul>
+      )}
+    </div>
+  )
+}