fix: photo display, duplicate detection, memory photos

- Remove duplicate FamilyUploadSection from public page
- Remove 'Von Anonym' caption from user-uploaded gallery photos
- Add SHA-256 duplicate detection in upload route (same file → same path)
- Fix timeline photos: use object-contain instead of object-cover (no clipping)
- Fix timeline modal photos: remove fixed h-48 height
- Add photo display support to MemorySection component
- Include media_filenames in memory contribution queries
- Add media_filenames to Memory type

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/components/TimelineSection.tsx

@@ -197,7 +197,7 @@ export default function TimelineSection({ entries }: TimelineSectionProps) {
                             key={i}
                             src={`/api/files/${filename.trim()}`}
                             alt=""
-                            className="w-full h-24 object-cover rounded-lg"
+                            className="w-full max-h-40 object-contain rounded-lg bg-warm-brown/5"
                           />
                         ))}
                       </div>
@@ -310,7 +310,7 @@ export default function TimelineSection({ entries }: TimelineSectionProps) {
                         key={i}
                         src={`/api/files/${filename.trim()}`}
                         alt=""
-                        className="w-full h-48 object-cover rounded-lg"
+                        className="w-full object-contain rounded-lg bg-warm-brown/5"
                       />
                     ))}
                   </div>