Update to use commons package

- Rename module from publisher to publish
- Change all shared.* references to commons.*
- Use commons.Item, commons.Feed, etc from shared library

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

items.go

@@ -8,11 +8,11 @@ import (
 )
 
 // scanItems scans rows into Item structs
-func scanItems(rows pgx.Rows) ([]*shared.Item, error) {
-	var items []*shared.Item
+func scanItems(rows pgx.Rows) ([]*commons.Item, error) {
+	var items []*commons.Item
 
 	for rows.Next() {
-		item := &shared.Item{}
+		item := &commons.Item{}
 		var guid, title, link, description, content, author *string
 		var pubDate, updatedAt, publishedAt *interface{}
 		var publishedUri *string
@@ -32,13 +32,13 @@ func scanItems(rows pgx.Rows) ([]*shared.Item, error) {
 			continue
 		}
 
-		item.GUID = shared.StringValue(guid)
-		item.Title = shared.StringValue(title)
-		item.Link = shared.StringValue(link)
-		item.Description = shared.StringValue(description)
-		item.Content = shared.StringValue(content)
-		item.Author = shared.StringValue(author)
-		item.PublishedUri = shared.StringValue(publishedUri)
+		item.GUID = commons.StringValue(guid)
+		item.Title = commons.StringValue(title)
+		item.Link = commons.StringValue(link)
+		item.Description = commons.StringValue(description)
+		item.Content = commons.StringValue(content)
+		item.Author = commons.StringValue(author)
+		item.PublishedUri = commons.StringValue(publishedUri)
 
 		if pubDate != nil {
 			if t, ok := (*pubDate).(interface{ Time() interface{} }); ok {
@@ -49,9 +49,9 @@ func scanItems(rows pgx.Rows) ([]*shared.Item, error) {
 		}
 
 		if enclosureUrl != nil && *enclosureUrl != "" {
-			item.Enclosure = &shared.Enclosure{
+			item.Enclosure = &commons.Enclosure{
 				URL:  *enclosureUrl,
-				Type: shared.StringValue(enclosureType),
+				Type: commons.StringValue(enclosureType),
 			}
 			if enclosureLength != nil {
 				item.Enclosure.Length = *enclosureLength