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/app/page.tsx

@@ -41,7 +41,7 @@ export default async function HomePage() {
   try {
     userMemories = plain(
       db.prepare(`
-        SELECT id, name, title, content, created_at 
+        SELECT id, name, title, content, media_filenames, created_at 
         FROM contributions 
         WHERE status = 'approved' AND type = 'memory'
         ORDER BY created_at DESC
@@ -58,6 +58,8 @@ export default async function HomePage() {
       id: m.id,
       title: m.title || 'Erinnerung',
       content: m.content,
+      author: m.name || null,
+      media_filenames: m.media_filenames || null,
       created_at: m.created_at,
       updated_at: m.created_at,
     }))
@@ -144,7 +146,7 @@ export default async function HomePage() {
         filename: filename.trim(),
         original_name: null,
         type: 'photo' as const,
-        caption: `Von ${c.name || 'Anonym'}`,
+        caption: null,
         sort_order: 9998,
         status: 'approved' as const,
         created_at: c.created_at,