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/usage_helpers.go

@@ -0,0 +1,29 @@
+package app
+
+import (
+	"context"
+
+	"gorm.io/gorm"
+	"stream.api/internal/database/model"
+	"stream.api/pkg/logger"
+)
+
+type usagePayload struct {
+	UserID       string `json:"user_id"`
+	TotalVideos  int64  `json:"total_videos"`
+	TotalStorage int64  `json:"total_storage"`
+}
+
+func loadUsage(ctx context.Context, db *gorm.DB, l logger.Logger, user *model.User) (*usagePayload, error) {
+	var totalVideos int64
+	if err := db.WithContext(ctx).Model(&model.Video{}).Where("user_id = ?", user.ID).Count(&totalVideos).Error; err != nil {
+		l.Error("Failed to count user videos", "error", err, "user_id", user.ID)
+		return nil, err
+	}
+
+	return &usagePayload{
+		UserID:       user.ID,
+		TotalVideos:  totalVideos,
+		TotalStorage: user.StorageUsed,
+	}, nil
+}