chore(tests, dependencies, build): optimize test assertions, fix mocking issues, and update dependencies

- Simplified test assertions by removing redundant type casting in `ResultTest`.
- Improved Redis mock behavior and verification leniency in `RedisDistributedCacheTest`.
- Updated dependency versions in `libs.versions.toml` (e.g., downgraded `ktor` and adjusted `composeMultiplatform`).
- Refined Gradle build scripts for consistent compiler args and testing configurations (e.g., disabled browser tests in frontend).
- Addressed mocking issues in `RedisDistributedCacheTest` to prevent `NoSuchMethodError`.
- Fixed package imports due to framework updates in Spring Boot and Micrometer-related components.

backend/infrastructure/event-store/event-store-api/build.gradle.kts

@@ -11,8 +11,7 @@ kotlin {
     compilerOptions {
         // Optimierungen für API-Module
         freeCompilerArgs.addAll(
-            "-opt-in=kotlin.time.ExperimentalTime",
-            "-jvm-default=all"
+            "-opt-in=kotlin.time.ExperimentalTime"
         )
     }
 }