added comments

backend/internal/model/init.go

@@ -7,6 +7,7 @@ import (
 	"gorm.io/gorm"
 )
 
+// Init initializes the database connection, auto-migrates models, and seeds a default post.
 func Init() *gorm.DB {
 	db, err := gorm.Open(sqlite.Open("./blog.db"))
 	if err != nil {