Simplify

- Drop lazy LoadRepo/LoadOwner in convert.ToProject; rely on caller
  preloading. ListProjects sets Repo from ctx.Repo.Repository on each
  project; CreateProject does the same on the new project. Avoids
  N+1 queries for repo-scoped list endpoints.
- Strip redundant API struct field comments that just restate the
  field name; keep the ones that document enum values.
- Pre-allocate GetColumnsByIDs result slice with len(columnsIDs).
- Fix CountProjectColumns doc comment (was "CountColumns").

Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

models/project/column_list.go

@@ -9,7 +9,7 @@ import (
 	"code.gitea.io/gitea/models/db"
 )
 
-// CountColumns returns the total number of columns for a project
+// CountProjectColumns returns the total number of columns for a project
 func CountProjectColumns(ctx context.Context, projectID int64) (int64, error) {
 	return db.GetEngine(ctx).Where("project_id=?", projectID).Count(&Column{})
 }
@@ -28,7 +28,7 @@ func GetProjectColumns(ctx context.Context, projectID int64, opts db.ListOptions
 }
 
 func GetColumnsByIDs(ctx context.Context, projectID int64, columnsIDs []int64) (ColumnList, error) {
-	columns := make([]*Column, 0, 5)
+	columns := make([]*Column, 0, len(columnsIDs))
 	if len(columnsIDs) == 0 {
 		return columns, nil
 	}