Fix DB driver auto-detection, root 404, and linting

- Removed hardcoded `driver-class-name` from `application.yaml` to fix production startup failure with PostgreSQL.
- Handled `NoResourceFoundException` in `ApiExceptionHandler` to return 404 for unmapped paths (like `/`).
- Fixed import ordering in `ApiExceptionHandler.kt` to satisfy `ktlint`.
- Added `NotFoundControllerTest` to verify fix.

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

src/main/kotlin/com/project/movienight/adapters/web/ApiExceptionHandler.kt

@@ -11,8 +11,8 @@ import org.springframework.web.bind.MethodArgumentNotValidException
 import org.springframework.web.bind.annotation.ExceptionHandler
 import org.springframework.web.bind.annotation.ResponseStatus
 import org.springframework.web.bind.annotation.RestControllerAdvice
-import org.springframework.web.servlet.resource.NoResourceFoundException
 import org.springframework.web.server.ResponseStatusException
+import org.springframework.web.servlet.resource.NoResourceFoundException
 
 @RestControllerAdvice
 class ApiExceptionHandler {