refactor(media): consolidate upload/edit/download into MediaService

Merge UploadService, EditService, JobOrchestrationService, and
DownloadService into a single MediaService with a unified Job lifecycle
(READY → PROCESSING → SUCCEEDED/FAILED via JobState enum).

- Add MediaController (/api/v1/media) exposing compress, save, and clip
- Add JobController (/api/v1/job) for status polling and file download
- Move clip/thumbnail download into ClipController (/{id}/media, /{id}/thumbnail)
- Move stream saveSection/clip from StreamService into MediaService
- Simplify Job DTO: remove dual ClipOptions/files, add ProgressTracker and download file
- Refactor JobRegistryService.add() → generateJob() to co-locate creation and registration
- Wire FFmpeg out_time_ms progress parsing into StreamActionsService via CommandRunner
- Rename GET /api/v1/auth/user → GET /api/v1/user/me
- Delete DownloadController, MetadataController, UploadController

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

@@ -1,28 +1,21 @@
 package com.ddf.vodsystem.dto;
 
-import java.io.File;
 import lombok.Data;
 
+import java.io.File;
+import java.time.Instant;
+
 @Data
 public class Job {
     private String uuid;
-    private File inputFile;
-    private File outputFile;
+    private ProgressTracker progressTracker = new ProgressTracker();
+    private JobState state = JobState.READY;
+    private String errorOutput;
 
-    // configs
-    private ClipOptions inputClipOptions;
-    private ClipOptions outputClipOptions = new ClipOptions();
+    private File download;
+    private Instant createdAt = Instant.now();
 
-    // job status
-    private JobStatus status = new JobStatus();
-
-    public Job(String uuid,
-               File inputFile,
-               File outputFile,
-               ClipOptions inputClipOptions) {
+    public Job(String uuid) {
         this.uuid = uuid;
-        this.inputFile = inputFile;
-        this.outputFile = outputFile;
-        this.inputClipOptions = inputClipOptions;
     }
 }

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

@@ -0,0 +1,8 @@
+package com.ddf.vodsystem.dto;
+
+public enum JobState {
+    READY,
+    PROCESSING,
+    SUCCEEDED,
+    FAILED
+}