Add per-user library settings, folder passwords, and a still picker.

Settings manages folders, thumbnail defaults, and passwords for the signed-in account, and choosing an image now browses saved stills instead of only the desktop file dialog.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/api/library/stills/[id].get.ts

@@ -0,0 +1,16 @@
+import { existsSync, readFileSync } from 'node:fs'
+
+export default defineEventHandler((event) => {
+  const { owner } = assertLibraryOwner(event)
+  const id = String(getRouterParam(event, 'id') || '')
+  const still = getStill(owner, id)
+  assertFolderAccess(event, still.folderId)
+  const path = stillPath(owner, still.id)
+  if (!existsSync(path)) {
+    throw createError({ statusCode: 404, statusMessage: 'Image file is missing' })
+  }
+  const buf = readFileSync(path)
+  setHeader(event, 'Content-Type', imageContentType(buf))
+  setHeader(event, 'Cache-Control', 'private, max-age=3600')
+  return buf
+})