Adding structure and testing around title support

internal/models/note.go

@@ -4,10 +4,16 @@ import (
 	"time"
 )
 
+const (
+	NoteTitleMaxLength = 50
+)
+
 // Note represents a single note with its metadata.
 type Note struct {
 	// ID is the unique identifier of the note.
 	ID int `json:"id"`
+	// Title is a short title for human identification of a note
+	Title string `json:"title"`
 	// LastUpdate is the timestamp of when the note was last modified.
 	LastUpdate time.Time `json:"last_update"`
 	// Content is the actual text content of the note.