feat: Add player_configs feature and migrate user preferences

- Implemented player_configs table to store multiple player configurations per user.
- Migrated existing player settings from user_preferences to player_configs.
- Removed player-related columns from user_preferences.
- Added referral state fields to user for tracking referral rewards.
- Created migration scripts for database changes and data migration.
- Added test cases for app services and usage helpers.
- Introduced video job service interfaces and implementations.

internal/rpc/app/preferences_helpers.go

@@ -0,0 +1,63 @@
+package app
+
+import (
+	"context"
+	"strings"
+
+	"gorm.io/gorm"
+	"stream.api/internal/database/model"
+	"stream.api/pkg/logger"
+)
+
+type updatePreferencesInput struct {
+	EmailNotifications     *bool
+	PushNotifications      *bool
+	MarketingNotifications *bool
+	TelegramNotifications  *bool
+	Language               *string
+	Locale                 *string
+}
+
+func loadUserPreferences(ctx context.Context, db *gorm.DB, userID string) (*model.UserPreference, error) {
+	return model.FindOrCreateUserPreference(ctx, db, userID)
+}
+
+func updateUserPreferences(ctx context.Context, db *gorm.DB, l logger.Logger, userID string, req updatePreferencesInput) (*model.UserPreference, error) {
+	pref, err := model.FindOrCreateUserPreference(ctx, db, userID)
+	if err != nil {
+		l.Error("Failed to load preferences", "error", err)
+		return nil, err
+	}
+
+	if req.EmailNotifications != nil {
+		pref.EmailNotifications = model.BoolPtr(*req.EmailNotifications)
+	}
+	if req.PushNotifications != nil {
+		pref.PushNotifications = model.BoolPtr(*req.PushNotifications)
+	}
+	if req.MarketingNotifications != nil {
+		pref.MarketingNotifications = *req.MarketingNotifications
+	}
+	if req.TelegramNotifications != nil {
+		pref.TelegramNotifications = *req.TelegramNotifications
+	}
+	if req.Language != nil {
+		pref.Language = model.StringPtr(strings.TrimSpace(*req.Language))
+	}
+	if req.Locale != nil {
+		pref.Locale = model.StringPtr(strings.TrimSpace(*req.Locale))
+	}
+	if strings.TrimSpace(model.StringValue(pref.Language)) == "" {
+		pref.Language = model.StringPtr("en")
+	}
+	if strings.TrimSpace(model.StringValue(pref.Locale)) == "" {
+		pref.Locale = model.StringPtr(model.StringValue(pref.Language))
+	}
+
+	if err := db.WithContext(ctx).Save(pref).Error; err != nil {
+		l.Error("Failed to save preferences", "error", err)
+		return nil, err
+	}
+
+	return pref, nil
+}