feat(web): add setting for minimum face count for face detection (#4128)

* feat: add setting for minimum face count for face detection

Adds the minimum face count setting to the web interface to
circumvent detection of strangers and random background people
if desired.

* fix: codestyle, remove max for face count

server/src/domain/smart-info/dto/model-config.dto.ts

@@ -48,4 +48,10 @@ export class RecognitionConfig extends ModelConfig {
   @Type(() => Number)
   @ApiProperty({ type: 'integer' })
   maxDistance!: number;
+
+  @IsNumber()
+  @Min(1)
+  @Type(() => Number)
+  @ApiProperty({ type: 'integer' })
+  minFaces!: number;
 }