feat(10-02): add sqlc queries for libraries and update playlist queries for phantom support

- Create libraries.sql with 7 CRUD queries (create, get, get-by-path, list, update, delete, count)
- Update playlists.sql: AddPlaylistTrack now accepts 9 params including phantom metadata
- Update playlist queries to use LEFT JOIN for nullable audio_file_id
- Add GetTrackPhantomMetadata helper query for eager phantom population
- Add is_phantom computed column to metadata queries
- Add GetAudioFilesByLibrary and CountAudioFilesByLibrary queries
- Regenerate all sqlc code

backend/database/sql/sqlcgen/libraries.sql.go

@@ -0,0 +1,130 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.30.0
+// source: libraries.sql
+
+package sqlcgen
+
+import (
+	"context"
+)
+
+const countLibraries = `-- name: CountLibraries :one
+SELECT COUNT(*) AS count FROM libraries
+`
+
+func (q *Queries) CountLibraries(ctx context.Context) (int64, error) {
+	row := q.db.QueryRowContext(ctx, countLibraries)
+	var count int64
+	err := row.Scan(&count)
+	return count, err
+}
+
+const createLibrary = `-- name: CreateLibrary :one
+INSERT INTO libraries (name, path) VALUES (?, ?)
+RETURNING id, name, path, created_at
+`
+
+type CreateLibraryParams struct {
+	Name string
+	Path string
+}
+
+func (q *Queries) CreateLibrary(ctx context.Context, arg CreateLibraryParams) (Library, error) {
+	row := q.db.QueryRowContext(ctx, createLibrary, arg.Name, arg.Path)
+	var i Library
+	err := row.Scan(
+		&i.ID,
+		&i.Name,
+		&i.Path,
+		&i.CreatedAt,
+	)
+	return i, err
+}
+
+const deleteLibrary = `-- name: DeleteLibrary :exec
+DELETE FROM libraries WHERE id = ?
+`
+
+func (q *Queries) DeleteLibrary(ctx context.Context, id int64) error {
+	_, err := q.db.ExecContext(ctx, deleteLibrary, id)
+	return err
+}
+
+const getAllLibraries = `-- name: GetAllLibraries :many
+SELECT id, name, path, created_at FROM libraries ORDER BY name
+`
+
+func (q *Queries) GetAllLibraries(ctx context.Context) ([]Library, error) {
+	rows, err := q.db.QueryContext(ctx, getAllLibraries)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []Library
+	for rows.Next() {
+		var i Library
+		if err := rows.Scan(
+			&i.ID,
+			&i.Name,
+			&i.Path,
+			&i.CreatedAt,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
+const getLibrary = `-- name: GetLibrary :one
+SELECT id, name, path, created_at FROM libraries WHERE id = ? LIMIT 1
+`
+
+func (q *Queries) GetLibrary(ctx context.Context, id int64) (Library, error) {
+	row := q.db.QueryRowContext(ctx, getLibrary, id)
+	var i Library
+	err := row.Scan(
+		&i.ID,
+		&i.Name,
+		&i.Path,
+		&i.CreatedAt,
+	)
+	return i, err
+}
+
+const getLibraryByPath = `-- name: GetLibraryByPath :one
+SELECT id, name, path, created_at FROM libraries WHERE path = ? LIMIT 1
+`
+
+func (q *Queries) GetLibraryByPath(ctx context.Context, path string) (Library, error) {
+	row := q.db.QueryRowContext(ctx, getLibraryByPath, path)
+	var i Library
+	err := row.Scan(
+		&i.ID,
+		&i.Name,
+		&i.Path,
+		&i.CreatedAt,
+	)
+	return i, err
+}
+
+const updateLibraryName = `-- name: UpdateLibraryName :exec
+UPDATE libraries SET name = ? WHERE id = ?
+`
+
+type UpdateLibraryNameParams struct {
+	Name string
+	ID   int64
+}
+
+func (q *Queries) UpdateLibraryName(ctx context.Context, arg UpdateLibraryNameParams) error {
+	_, err := q.db.ExecContext(ctx, updateLibraryName, arg.Name, arg.ID)
+	return err
+}