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/configuration/SecurityConfig.java

@@ -32,7 +32,7 @@ public class SecurityConfig {
                         .requestMatchers("/api/v1/download/clip/**").authenticated()
                         .requestMatchers("/api/v1/auth/login", "/api/v1/auth/user").permitAll()
                         .requestMatchers("/api/v1/upload", "/api/v1/download/**").permitAll()
-                        .requestMatchers("/api/v1/edit/**", "/api/v1/process/**", "/api/v1/progress/**").permitAll()
+                        .requestMatchers("/api/v1/edit/**", "/api/v1/process/**", "/api/v1/progress/**", "/api/v1/convert/**").permitAll()
                         .requestMatchers("/api/v1/metadata/**").permitAll()
                         .anyRequest().authenticated()
                 )