refactor: settings format picker redesign with Audio/Video sub-pickers, fix delete routing

- Replace Type/Quality settings with single Format button -> Audio/Video sub-pickers
- Each sub-picker shows format options (bitrates for audio, resolutions for video)
- Replace DefaultQuality with DefaultAudioFormat/DefaultVideoFormat in UserPreferences
- Add DB migration 002 for new preference columns
- Update repo layer SQL queries for new schema
- Update playlist flow to use new preference fields
- Fix missing deleteaccount and delaccount_ callback routing
- Add back_format routing for format picker navigation

internal/handler/settings.go

@@ -12,16 +12,13 @@ import (
 )
 
 func (h *Handler) buildSettingsKeyboard(userID int64, prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
-	mediaTypeLabel := "Video+Audio"
-	switch prefs.DefaultMediaType {
-	case domain.MediaTypeAudio:
-		mediaTypeLabel = "Audio Only"
-	case domain.MediaTypeVideo:
-		mediaTypeLabel = "Video Only"
+	audioFmt := prefs.DefaultAudioFormat
+	if audioFmt == "" {
+		audioFmt = "best"
 	}
-	qualityLabel := prefs.DefaultQuality
-	if qualityLabel == "" {
-		qualityLabel = "best"
+	videoFmt := prefs.DefaultVideoFormat
+	if videoFmt == "" {
+		videoFmt = "best"
 	}
 	containerLabel := prefs.DefaultContainer
 	if containerLabel == "" {
@@ -34,8 +31,7 @@ func (h *Handler) buildSettingsKeyboard(userID int64, prefs *domain.UserPreferen
 
 	rows := [][]models.InlineKeyboardButton{
 		{
-			{Text: fmt.Sprintf("Type: %s", mediaTypeLabel), CallbackData: "settings_media_type"},
-			{Text: fmt.Sprintf("Quality: %s", qualityLabel), CallbackData: "settings_quality"},
+			{Text: fmt.Sprintf("Format: %s/%s", audioFmt, videoFmt), CallbackData: "settings_format"},
 		},
 		{
 			{Text: fmt.Sprintf("Container: %s", containerLabel), CallbackData: "settings_container"},
@@ -73,11 +69,14 @@ func (h *Handler) handleSettingsSelection(ctx context.Context, chatID int64, msg
 	}
 
 	switch setting {
-	case "media_type":
-		text, kb := h.buildMediaTypePicker(prefs)
+	case "format":
+		text, kb := h.buildFormatPicker(prefs)
 		h.editText(ctx, chatID, msgID, text, &kb)
-	case "quality":
-		text, kb := h.buildQualityPicker(prefs)
+	case "format_audio":
+		text, kb := h.buildAudioFormatPicker(prefs)
+		h.editText(ctx, chatID, msgID, text, &kb)
+	case "format_video":
+		text, kb := h.buildVideoFormatPicker(prefs)
 		h.editText(ctx, chatID, msgID, text, &kb)
 	case "container":
 		text, kb := h.buildContainerPicker(prefs)
@@ -88,53 +87,54 @@ func (h *Handler) handleSettingsSelection(ctx context.Context, chatID int64, msg
 	}
 }
 
-func (h *Handler) buildMediaTypePicker(prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
-	options := []struct {
-		label string
-		value domain.MediaType
-		data  string
-	}{
-		{"Audio Only", domain.MediaTypeAudio, "settings_set_type_audio"},
-		{"Video Only", domain.MediaTypeVideo, "settings_set_type_video"},
-		{"Video+Audio", domain.MediaTypeVideoAudio, "settings_set_type_both"},
+func (h *Handler) buildFormatPicker(prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
+	rows := [][]models.InlineKeyboardButton{
+		{{Text: "Audio", CallbackData: "settings_format_audio"}},
+		{{Text: "Video", CallbackData: "settings_format_video"}},
+		{{Text: "Back to Settings", CallbackData: "back_settings"}},
 	}
+	return "Choose format type to set default:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
+}
+
+func (h *Handler) buildAudioFormatPicker(prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
+	bitrates := []string{"best", "128k", "192k", "256k", "320k"}
 	rows := [][]models.InlineKeyboardButton{}
-	for _, opt := range options {
-		label := opt.label
-		if opt.value == prefs.DefaultMediaType {
+	for _, b := range bitrates {
+		label := b
+		if b == prefs.DefaultAudioFormat {
 			label = "> " + label
 		}
 		rows = append(rows, []models.InlineKeyboardButton{
-			{Text: label, CallbackData: opt.data},
+			{Text: label, CallbackData: "settings_set_audioformat_" + b},
 		})
 	}
 	rows = append(rows, []models.InlineKeyboardButton{
-		{Text: "Back to Settings", CallbackData: "back_settings"},
+		{Text: "Back", CallbackData: "back_format"},
 	})
-	return "Select default media type:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
+	return "Select default audio format:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
 }
 
-func (h *Handler) buildQualityPicker(prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
-	qualities := []string{"best", "2160p", "1080p", "720p", "480p", "360p"}
+func (h *Handler) buildVideoFormatPicker(prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
+	resolutions := []string{"best", "2160p", "1440p", "1080p", "720p", "480p", "360p"}
 	rows := [][]models.InlineKeyboardButton{}
 	row := []models.InlineKeyboardButton{}
-	for i, q := range qualities {
-		label := q
-		if q == prefs.DefaultQuality {
+	for i, r := range resolutions {
+		label := r
+		if r == prefs.DefaultVideoFormat {
 			label = "> " + label
 		}
 		row = append(row, models.InlineKeyboardButton{
-			Text: label, CallbackData: "settings_set_quality_" + q,
+			Text: label, CallbackData: "settings_set_videoformat_" + r,
 		})
-		if len(row) == 3 || i == len(qualities)-1 {
+		if len(row) == 3 || i == len(resolutions)-1 {
 			rows = append(rows, row)
 			row = nil
 		}
 	}
 	rows = append(rows, []models.InlineKeyboardButton{
-		{Text: "Back to Settings", CallbackData: "back_settings"},
+		{Text: "Back", CallbackData: "back_format"},
 	})
-	return "Select default quality:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
+	return "Select default video format:", models.InlineKeyboardMarkup{InlineKeyboard: rows}
 }
 
 func (h *Handler) buildContainerPicker(prefs *domain.UserPreferences) (string, models.InlineKeyboardMarkup) {
@@ -203,18 +203,11 @@ func (h *Handler) handleSettingsSet(ctx context.Context, chatID int64, msgID int
 
 	changed := false
 	switch action {
-	case "type":
-		switch value {
-		case "audio":
-			prefs.DefaultMediaType = domain.MediaTypeAudio
-		case "video":
-			prefs.DefaultMediaType = domain.MediaTypeVideo
-		case "both":
-			prefs.DefaultMediaType = domain.MediaTypeVideoAudio
-		}
+	case "audioformat":
+		prefs.DefaultAudioFormat = value
 		changed = true
-	case "quality":
-		prefs.DefaultQuality = value
+	case "videoformat":
+		prefs.DefaultVideoFormat = value
 		changed = true
 	case "container":
 		prefs.DefaultContainer = value