feat(users): audio_resume_rewind_seconds column

Per-user resume rewind for the audiobook/podcast player: how many
seconds (0/5/10) before the saved position playback starts, both on
open-resume and again on every genuine unpause. Motivated by the car
startup case — exact resume loses the listener's place, and the
PlaybackRequestResolver path (phone UI, Android Auto, media buttons)
all funnel through one start position.

0 = exact resume (default), so the column is inert until the profile
page sets it. Follows the default_audio_speed / keep_screen_awake
precedent: idempotent ALTER in schema.sql (re-runs on every boot),
explicit GetUser SELECT, dedicated :exec update. Handler-side strict
allow-list {0,5,10} lands with the API slice.

internal/database/queries.sql.go

@@ -11407,26 +11407,28 @@ SELECT
     u.timezone,
     u.default_audio_speed,
     u.keep_screen_awake,
+    u.audio_resume_rewind_seconds,
     (SELECT COUNT(*) FROM devices WHERE user_id = u.id) as device_count
 FROM users u
 WHERE u.id = $1
 `
 
 type GetUserRow struct {
-	ID                pgtype.UUID        `db:"id" json:"id"`
-	Email             string             `db:"email" json:"email"`
-	Username          string             `db:"username" json:"username"`
-	Theme             pgtype.Text        `db:"theme" json:"theme"`
-	FirstName         pgtype.Text        `db:"first_name" json:"first_name"`
-	LastName          pgtype.Text        `db:"last_name" json:"last_name"`
-	Role              string             `db:"role" json:"role"`
-	MaxDevices        pgtype.Int4        `db:"max_devices" json:"max_devices"`
-	CreatedAt         pgtype.Timestamptz `db:"created_at" json:"created_at"`
-	UpdatedAt         pgtype.Timestamptz `db:"updated_at" json:"updated_at"`
-	Timezone          pgtype.Text        `db:"timezone" json:"timezone"`
-	DefaultAudioSpeed float32            `db:"default_audio_speed" json:"default_audio_speed"`
-	KeepScreenAwake   bool               `db:"keep_screen_awake" json:"keep_screen_awake"`
-	DeviceCount       int64              `db:"device_count" json:"device_count"`
+	ID                       pgtype.UUID        `db:"id" json:"id"`
+	Email                    string             `db:"email" json:"email"`
+	Username                 string             `db:"username" json:"username"`
+	Theme                    pgtype.Text        `db:"theme" json:"theme"`
+	FirstName                pgtype.Text        `db:"first_name" json:"first_name"`
+	LastName                 pgtype.Text        `db:"last_name" json:"last_name"`
+	Role                     string             `db:"role" json:"role"`
+	MaxDevices               pgtype.Int4        `db:"max_devices" json:"max_devices"`
+	CreatedAt                pgtype.Timestamptz `db:"created_at" json:"created_at"`
+	UpdatedAt                pgtype.Timestamptz `db:"updated_at" json:"updated_at"`
+	Timezone                 pgtype.Text        `db:"timezone" json:"timezone"`
+	DefaultAudioSpeed        float32            `db:"default_audio_speed" json:"default_audio_speed"`
+	KeepScreenAwake          bool               `db:"keep_screen_awake" json:"keep_screen_awake"`
+	AudioResumeRewindSeconds int32              `db:"audio_resume_rewind_seconds" json:"audio_resume_rewind_seconds"`
+	DeviceCount              int64              `db:"device_count" json:"device_count"`
 }
 
 func (q *Queries) GetUser(ctx context.Context, id pgtype.UUID) (GetUserRow, error) {
@@ -11446,6 +11448,7 @@ func (q *Queries) GetUser(ctx context.Context, id pgtype.UUID) (GetUserRow, erro
 		&i.Timezone,
 		&i.DefaultAudioSpeed,
 		&i.KeepScreenAwake,
+		&i.AudioResumeRewindSeconds,
 		&i.DeviceCount,
 	)
 	return i, err
@@ -20287,6 +20290,20 @@ func (q *Queries) UpdateUniversalProgress(ctx context.Context, arg UpdateUnivers
 	return i, err
 }
 
+const UpdateUserAudioResumeRewind = `-- name: UpdateUserAudioResumeRewind :exec
+UPDATE users SET audio_resume_rewind_seconds = $2, updated_at = NOW() WHERE id = $1
+`
+
+type UpdateUserAudioResumeRewindParams struct {
+	ID                       pgtype.UUID `db:"id" json:"id"`
+	AudioResumeRewindSeconds int32       `db:"audio_resume_rewind_seconds" json:"audio_resume_rewind_seconds"`
+}
+
+func (q *Queries) UpdateUserAudioResumeRewind(ctx context.Context, arg UpdateUserAudioResumeRewindParams) error {
+	_, err := q.db.Exec(ctx, UpdateUserAudioResumeRewind, arg.ID, arg.AudioResumeRewindSeconds)
+	return err
+}
+
 const UpdateUserDefaultAudioSpeed = `-- name: UpdateUserDefaultAudioSpeed :exec
 UPDATE users SET default_audio_speed = $2, updated_at = NOW() WHERE id = $1
 `
@@ -20317,7 +20334,7 @@ func (q *Queries) UpdateUserKeepScreenAwake(ctx context.Context, arg UpdateUserK
 
 const UpdateUserMaxDevices = `-- name: UpdateUserMaxDevices :one
 UPDATE users SET max_devices = $2, updated_at = NOW() WHERE id = $1
-RETURNING id, email, username, password_hash, first_name, last_name, role, theme, max_devices, created_at, timezone, updated_at, default_audio_speed, keep_screen_awake
+RETURNING id, email, username, password_hash, first_name, last_name, role, theme, max_devices, created_at, timezone, updated_at, default_audio_speed, keep_screen_awake, audio_resume_rewind_seconds
 `
 
 type UpdateUserMaxDevicesParams struct {
@@ -20343,6 +20360,7 @@ func (q *Queries) UpdateUserMaxDevices(ctx context.Context, arg UpdateUserMaxDev
 		&i.UpdatedAt,
 		&i.DefaultAudioSpeed,
 		&i.KeepScreenAwake,
+		&i.AudioResumeRewindSeconds,
 	)
 	return i, err
 }