fix(tests): resolve EntriesIsolationIntegrationTest failures with test-specific DB config

- Added `TestExposedConfiguration` to connect Exposed with Spring `DataSource` in the `test` profile.
- Downgraded `springdoc` version from `3.0.0` to `2.8.9` for Spring Boot 3.x compatibility.
- Applied `@ActiveProfiles("test")` to `EntriesIsolationIntegrationTest`.
- Updated roadmap documentation to reflect bugfix and test success.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

frontend/features/veranstalter-feature/src/jvmMain/kotlin/at/mocode/frontend/features/veranstalter/data/remote/DefaultVeranstalterRepository.kt

@@ -1,6 +1,6 @@
 package at.mocode.frontend.features.veranstalter.data.remote
 
-import at.mocode.frontend.core.network.ApiRoutes
+import at.mocode.frontend.core.network.*
 import at.mocode.frontend.features.veranstalter.data.mapper.toDomain
 import at.mocode.frontend.features.veranstalter.data.mapper.toDto
 import at.mocode.frontend.features.veranstalter.data.remote.dto.VeranstalterDto
@@ -70,10 +70,3 @@ class DefaultVeranstalterRepository(
   }
 }
 
-// Fehler-Typen (vereinfachtes DomainError-Äquivalent)
-class AuthExpired : RuntimeException("AUTH_EXPIRED")
-class AuthForbidden : RuntimeException("AUTH_FORBIDDEN")
-class NotFound : RuntimeException("NOT_FOUND")
-class Conflict : RuntimeException("CONFLICT")
-class ServerError : RuntimeException("SERVER_ERROR")
-class HttpError(val code: Int) : RuntimeException("HTTP_$code")