refactor(video): prefix core files with video_

internal/video/video_entity.go

@@ -0,0 +1,12 @@
+package video
+
+import "time"
+
+type Video struct {
+	ID          uint      `gorm:"primaryKey"`
+	AuthorID    uint      `gorm:"index;not null"`
+	Title       string    `gorm:"type:varchar(255);not null"`
+	Description string    `gorm:"type:varchar(255);"`
+	PlayURL     string    `gorm:"type:varchar(255);not null"`
+	CreateTime  time.Time `gorm:"autoCreateTime"`
+}