chore: add code for 2 handlers with GET

backend/internal/storage/models.go

@@ -6,3 +6,8 @@ type Post struct {
 	Content   string `db:"content"`
 	CreatedAt string `db:"created_at"`
 }
+
+type PostReq struct {
+	Title   string `json:"title"`
+	Content string `json:"content"`
+}