feat: Update project structure and configuration files

backend/database/fields/posts.go

@@ -0,0 +1,27 @@
+package fields
+
+type MediaAsset struct {
+	Type  MediaAssetType `json:"type"`
+	Media int64          `json:"media"`
+	Mark  *string        `json:"mark,omitempty"`
+}
+
+// swagger:enum MediaAssetType
+// ENUM(
+// Unknown = "unknown",
+// Poster = "poster",
+// Image = "image",
+// Video = "video",
+// Audio = "audio",
+// Document = "document",
+// Other = "other"
+// )
+type MediaAssetType string
+
+// swagger:enum PostStatus
+// ENUM( draft, published )
+type PostStatus int16
+
+// swagger:enum PostType
+// ENUM( Article, Picture, Video, Audio)
+type PostType int16