feat: add runtime configuration for Caddy-based SPA containerization

Introduced `config.json` runtime configuration fetch mechanism to support the "Build Once, Deploy Everywhere" pattern. Replaced NGINX with Caddy for SPA deployment, enabling SPA routing, security headers, and static asset management. Updated Gradle and Kotlin/JS build configurations to align with the new runtime environment. Enhanced Dockerfile and health checks for optimized CI/CD workflows and improved SPA delivery.

frontend/core/domain/build.gradle.kts

@@ -9,24 +9,14 @@ plugins {
 }
 
 kotlin {
-  // Toolchain is now handled centrally in the root build.gradle.kts
-
-  // Wasm is now a first-class citizen in our stack, so we enable it by default
-  // val enableWasm = providers.gradleProperty("enableWasm").orNull == "true"
-
   jvm()
   js {
+    binaries.library()
     browser {
-      testTask { enabled = false }
+        testTask { enabled = false }
     }
   }
 
-  // Wasm vorerst deaktiviert
-  /*
-  @OptIn(org.jetbrains.kotlin.gradle.ExperimentalWasmDsl::class)
-  wasmJs { browser() }
-  */
-
   sourceSets {
     commonMain.dependencies {
       implementation(libs.kotlinx.serialization.json)