adding jwt authentication

backend/models/post.go

@@ -5,6 +5,7 @@ import "gorm.io/gorm"
 type Post struct {
 	gorm.Model        // includes ID, CreatedAt, UpdatedAt, DeletedAt
 	Title      string `gorm:"not null"`
-	Content    string `gorm:"type:text; not null"`
-	Author     string `gorm:"not null"`
+	AuthorID   uint
+	Author     User `gorm:"foreignKey:AuthorID"`
+	Content    string
 }