feat: locate post-related request DTOs

internal/dto/post_request.go

@@ -0,0 +1,13 @@
+package dto
+
+type CreatePostRequest struct {
+	Title   string `json:"title"`
+	URL     string `json:"url"`
+	Content string `json:"content"`
+}
+
+type UpdatePostRequest struct {
+	Title   string `json:"title"`
+	Content string `json:"content"`
+}
+