ADD thumbnail to database (#12)

* ADD thumbnail to database

* ADD thumbnail generation and retrieval functionality

* ADD thumbnail availability check in VideoCard component

* ADD ClipDTO to reduce exposed internals

* REFactor move APIResponse and VideoMetadata to dto package

* REMOVE unused props from VideoCard

* ADD isThumbnailAvailable function

src/main/java/com/ddf/vodsystem/entities/APIResponse.java

@@ -1,16 +0,0 @@
-package com.ddf.vodsystem.entities;
-
-import lombok.Data;
-
-@Data
-public class APIResponse<T> {
-    private String status;
-    private String message;
-    private T data;
-
-    public APIResponse(String status, String message, T data) {
-        this.status = status;
-        this.message = message;
-        this.data = data;
-    }
-}

src/main/java/com/ddf/vodsystem/entities/Clip.java

@@ -47,4 +47,7 @@ public class Clip {
 
     @Column(name = "video_path", nullable = false, length = 255)
     private String videoPath;
+
+    @Column(name = "thumbnail_path", nullable = false, length = 255)
+    private String thumbnailPath;
 }

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

@@ -3,6 +3,7 @@ package com.ddf.vodsystem.entities;
 import java.io.File;
 import java.util.concurrent.atomic.AtomicReference;
 
+import com.ddf.vodsystem.dto.VideoMetadata;
 import org.springframework.security.core.context.SecurityContext;
 
 import lombok.Data;

src/main/java/com/ddf/vodsystem/entities/VideoMetadata.java

@@ -1,15 +0,0 @@
-package com.ddf.vodsystem.entities;
-
-import lombok.Data;
-
-@Data
-public class VideoMetadata {
-    private String title;
-    private String description;
-    private Float startPoint;
-    private Float endPoint;
-    private Float fps;
-    private Integer width;
-    private Integer height;
-    private Float fileSize;
-}