Refactor GameyfinPlugin and ConfigurableGameyfinPlugin to fix SLF4J issue

gameyfin/build.gradle.kts

@@ -66,8 +66,7 @@ dependencies {
     implementation("ch.digitalfondue.mjml4j:mjml4j:1.0.3")
 
     // Plugins
-    implementation(project(":plugin-api"))
-    ksp("care.better.pf4j:pf4j-kotlin-symbol-processing:${rootProject.extra["pf4jKspVersion"]}")
+    compileOnly(project(":plugin-api"))
 
     // Utils
     implementation("org.apache.tika:tika-core:3.1.0")

gameyfin/src/main/kotlin/de/grimsi/gameyfin/core/download/DownloadEndpoint.kt

@@ -30,7 +30,7 @@ class DownloadEndpoint(
         return when (download) {
             is FileDownload -> {
                 ResponseEntity.ok()
-                    .header("Content-Disposition", "attachment; filename=\"${game.title}.zip\"")
+                    .header("Content-Disposition", "attachment; filename=\"${game.title}.${download.fileExtension}\"")
                     .body(StreamingResponseBody { outputStream ->
                         download.data.copyTo(outputStream)
                     })