Backend MP4 conversion (#23)

* ADD conversion queue

* ADD RemuxService for MP4 conversion

* REMOVE unused conversion queue

* REORGANISE Job-related classes

* ADD Job stages

* REVERT to old commit, using Spring Async instead

* ADD asynchronous processing for video tasks

* PATCH and streamline progress tracking

* ADD asynchronous video processing and job restructuring

* REFACTOR job service method

* ADD job remux functionality

* ADD remuxing endpoint

* PATCH complete flag not updating in API response

* ADD progress type in frontend

* ADD reset functionality for job status

* PATCH missing progress bar for subsequent exports

* REDESIGN settings box

* ADD tracking video file conversion in frontend

* PATCH extension bug

* REMOVE autowired decorator

src/main/java/com/ddf/vodsystem/dto/Job.java

@@ -0,0 +1,31 @@
+package com.ddf.vodsystem.dto;
+
+import java.io.File;
+
+import org.springframework.security.core.context.SecurityContext;
+
+import lombok.Data;
+
+@Data
+public class Job {
+    private String uuid;
+    private File inputFile;
+    private File outputFile;
+
+    // configs
+    private VideoMetadata inputVideoMetadata;
+    private VideoMetadata outputVideoMetadata = new VideoMetadata();
+
+    // security
+    private SecurityContext securityContext;
+
+    // job status
+    private JobStatus status = new JobStatus();
+
+    public Job(String uuid, File inputFile, File outputFile, VideoMetadata inputVideoMetadata) {
+        this.uuid = uuid;
+        this.inputFile = inputFile;
+        this.outputFile = outputFile;
+        this.inputVideoMetadata = inputVideoMetadata;
+    }
+}