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/design-system/build.gradle.kts

@@ -6,48 +6,27 @@ plugins {
 }
 
 kotlin {
-  // Toolchain is now handled centrally in the root build.gradle.kts
 
   jvm()
-  js(IR) {
-    browser()
-//        nodejs()
-  }
 
-  // Wasm vorerst deaktiviert
-  /*
-  @OptIn(org.jetbrains.kotlin.gradle.ExperimentalWasmDsl::class)
-  wasmJs {
-    browser()
+  js(IR) {
+    binaries.library()
+    // Explicitly select browser environment to satisfy Kotlin/JS compiler warning
+    browser {
+        testTask { enabled = false }
+    }
   }
-  */
 
   sourceSets {
     commonMain.dependencies {
-
-      // Compose dependencies
       implementation(compose.runtime)
       implementation(compose.foundation)
       implementation(compose.material3)
       implementation(compose.ui)
       implementation(compose.components.resources)
-
-      // Coroutines
       implementation(libs.kotlinx.coroutines.core)
-
-      // Serialization
       implementation(libs.kotlinx.serialization.json)
-
-      // DateTime
       implementation(libs.kotlinx.datetime)
     }
-
-    jsMain.dependencies {
-      // JS-specific UI dependencies if needed
-    }
-
-    jvmMain.dependencies {
-      // JVM-specific UI dependencies if needed
-    }
   }
 }