Implement user onboarding and enhanced .strm file creation

- Added automated onboarding dialog for new users to pick genres, eras, and content types.
- Enhanced "Add Movie" functionality to support folder-per-movie structure with Year and IMDb ID.
- Improved ui.js with custom dialogs for Onboarding, Rating, and Adding Movies.
- Fixed API accessibility by using standard [Authorize] attributes.
- Added "Mark Viewed" and "Sync" actions to the UI.

Co-authored-by: devitq <118541411+devitq@users.noreply.github.com>

src/main/kotlin/com/project/movienight/application/services/UserPreferencesService.kt

@@ -0,0 +1,29 @@
+package com.project.movienight.application.services
+
+import com.project.movienight.application.ports.input.GetUserPreferencesUseCase
+import com.project.movienight.application.ports.input.UpsertUserPreferencesCommand
+import com.project.movienight.application.ports.input.UpsertUserPreferencesUseCase
+import com.project.movienight.application.ports.output.UserPreferencesRepositoryPort
+import com.project.movienight.domain.model.UserPreferences
+import org.springframework.stereotype.Service
+
+@Service
+class UserPreferencesService(
+    private val userPreferencesRepository: UserPreferencesRepositoryPort,
+) : UpsertUserPreferencesUseCase,
+    GetUserPreferencesUseCase {
+    override fun upsert(command: UpsertUserPreferencesCommand): UserPreferences =
+        userPreferencesRepository.save(
+            UserPreferences(
+                userId = command.userId,
+                weightedGenres = command.weightedGenres,
+                plotTypes = command.plotTypes,
+                eras = command.eras,
+                castAndDirectors = command.castAndDirectors,
+                moods = command.moods,
+                contentTypes = command.contentTypes,
+            ),
+        )
+
+    override fun get(userId: java.util.UUID): UserPreferences? = userPreferencesRepository.findByUserId(userId)
+}