refactor: migrate API from GraphQL to REST (TypeSpec/OpenAPI)

Replace the entire GraphQL stack (gqlgen, urql, graphql-codegen) with a
TypeSpec → OpenAPI 3.x pipeline using oapi-codegen for Go server stubs
and openapi-fetch + openapi-typescript for the frontend client.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/backend/api/converters.go b/backend/api/converters.go
new file mode 100644
index 0000000..0ccbdc0
--- /dev/null
+++ b/backend/api/converters.go
@@ -0,0 +1,79 @@
+package api
+
+import (
+	"strconv"
+
+	"undef.ninja/x/feedaka/db"
+)
+
+func dbFeedToAPI(f db.Feed, unreadCount int64) Feed {
+	return Feed{
+		Id:           strconv.FormatInt(f.ID, 10),
+		Url:          f.Url,
+		Title:        f.Title,
+		FetchedAt:    f.FetchedAt,
+		IsSubscribed: f.IsSubscribed == 1,
+		UnreadCount:  int32(unreadCount),
+	}
+}
+
+type articleRow struct {
+	ID               int64
+	FeedID           int64
+	Guid             string
+	Title            string
+	Url              string
+	IsRead           int64
+	FeedID2          int64
+	FeedUrl          string
+	FeedTitle        string
+	FeedIsSubscribed int64
+}
+
+func toArticleRow(r any) articleRow {
+	switch v := r.(type) {
+	case db.GetArticlesPaginatedRow:
+		return articleRow{v.ID, v.FeedID, v.Guid, v.Title, v.Url, v.IsRead, v.FeedID2, v.FeedUrl, v.FeedTitle, v.FeedIsSubscribed}
+	case db.GetArticlesPaginatedAfterRow:
+		return articleRow{v.ID, v.FeedID, v.Guid, v.Title, v.Url, v.IsRead, v.FeedID2, v.FeedUrl, v.FeedTitle, v.FeedIsSubscribed}
+	case db.GetArticlesByFeedPaginatedRow:
+		return articleRow{v.ID, v.FeedID, v.Guid, v.Title, v.Url, v.IsRead, v.FeedID2, v.FeedUrl, v.FeedTitle, v.FeedIsSubscribed}
+	case db.GetArticlesByFeedPaginatedAfterRow:
+		return articleRow{v.ID, v.FeedID, v.Guid, v.Title, v.Url, v.IsRead, v.FeedID2, v.FeedUrl, v.FeedTitle, v.FeedIsSubscribed}
+	default:
+		panic("unexpected row type")
+	}
+}
+
+func rowToArticle(row articleRow) Article {
+	return Article{
+		Id:     strconv.FormatInt(row.ID, 10),
+		FeedId: strconv.FormatInt(row.FeedID, 10),
+		Guid:   row.Guid,
+		Title:  row.Title,
+		Url:    row.Url,
+		IsRead: row.IsRead == 1,
+		Feed: ArticleFeed{
+			Id:           strconv.FormatInt(row.FeedID2, 10),
+			Url:          row.FeedUrl,
+			Title:        row.FeedTitle,
+			IsSubscribed: row.FeedIsSubscribed == 1,
+		},
+	}
+}
+
+func dbArticleToAPI(row db.GetArticleRow) Article {
+	return Article{
+		Id:     strconv.FormatInt(row.ID, 10),
+		FeedId: strconv.FormatInt(row.FeedID, 10),
+		Guid:   row.Guid,
+		Title:  row.Title,
+		Url:    row.Url,
+		IsRead: row.IsRead == 1,
+		Feed: ArticleFeed{
+			Id:    strconv.FormatInt(row.FeedID2, 10),
+			Url:   row.FeedUrl,
+			Title: row.FeedTitle,
+		},
+	}
+}