feat: Implement video workflow repository and related services

- Added videoWorkflowRepository with methods to manage video and user interactions.
- Introduced catalog_mapper for converting database models to protobuf representations.
- Created domain_helpers for normalizing domain and ad format values.
- Defined service interfaces for payment, account, notification, domain, ad template, player config, video, and user management.
- Implemented OAuth helpers for generating state and caching keys.
- Developed payment_proto_helpers for mapping payment-related models to protobuf.
- Added service policy helpers to enforce plan requirements and user permissions.
- Created user_mapper for converting user payloads to protobuf format.
- Implemented value_helpers for handling various value conversions and nil checks.
- Developed video_helpers for normalizing video statuses and managing storage types.
- Created video_mapper for mapping video models to protobuf format.
- Implemented render workflow for managing video creation and job processing.

internal/repository/user_preference_repository.go

@@ -0,0 +1,24 @@
+package repository
+
+import (
+	"context"
+
+	"gorm.io/gorm"
+	"stream.api/internal/database/model"
+)
+
+type userPreferenceRepository struct {
+	db *gorm.DB
+}
+
+func NewUserPreferenceRepository(db *gorm.DB) *userPreferenceRepository {
+	return &userPreferenceRepository{db: db}
+}
+
+func (r *userPreferenceRepository) FindOrCreateByUserID(ctx context.Context, userID string) (*model.UserPreference, error) {
+	return model.FindOrCreateUserPreference(ctx, r.db, userID)
+}
+
+func (r *userPreferenceRepository) Save(ctx context.Context, pref *model.UserPreference) error {
+	return r.db.WithContext(ctx).Save(pref).Error
+}