feat(server): optimize person thumbnail generation (#7513)

* do crop and resize together

* redundant `pipelineColorspace` call

* formatting

* fix rebase

* handle orientation

* remove unused import

* formatting

* use oriented dimensions for half size calculation

* default case for orientation

* simplify orientation code

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

server/test/repositories/media.repository.mock.ts

@@ -3,10 +3,9 @@ import { Mocked, vitest } from 'vitest';
 
 export const newMediaRepositoryMock = (): Mocked<IMediaRepository> => {
   return {
+    generateThumbnail: vitest.fn(),
     generateThumbhash: vitest.fn(),
     extract: vitest.fn().mockResolvedValue(false),
-    resize: vitest.fn(),
-    crop: vitest.fn(),
     probe: vitest.fn(),
     transcode: vitest.fn(),
     getImageDimensions: vitest.fn(),