Get thumbnail from app (#68)

* Renamed multipart filed name 'files' to 'assetData'. 
* Added an additional field name of 'thumbnailData' to multipart form.
* Implemented upload mechanism for thumbnail directly from the mobile client.
* Removed dead code
* Implemented a version checking mechanism.

server/src/api-v1/server-info/server-info.controller.ts

@@ -5,6 +5,7 @@ import { JwtAuthGuard } from '../../modules/immich-jwt/guards/jwt-auth.guard';
 import { ServerInfoService } from './server-info.service';
 import mapboxGeocoding, { GeocodeService } from '@mapbox/mapbox-sdk/services/geocoding';
 import { MapiResponse } from '@mapbox/mapbox-sdk/lib/classes/mapi-response';
+import { serverVersion } from '../../constants/server_version.constant';
 
 @Controller('server-info')
 export class ServerInfoController {
@@ -30,4 +31,9 @@ export class ServerInfoController {
       mapboxSecret: this.configService.get('MAPBOX_KEY'),
     };
   }
+
+  @Get('/version')
+  async getServerVersion() {
+    return serverVersion;
+  }
 }