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/features/ping-feature/build.gradle.kts

@@ -2,8 +2,6 @@ import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 
 /**
  * Dieses Modul kapselt die gesamte UI und Logik für das Ping-Feature.
- * Es kennt seine eigenen technischen Abhängigkeiten (Ktor, Coroutines)
- * und den UI-Baukasten (common-ui), aber es kennt keine anderen Features.
  */
 plugins {
   alias(libs.plugins.kotlinMultiplatform)
@@ -16,45 +14,23 @@ group = "at.mocode.clients"
 version = "1.0.0"
 
 kotlin {
-  // Toolchain is now handled centrally in the root build.gradle.kts
-
   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 {
-      // Contract from backend
       implementation(projects.contracts.pingApi)
-
-      // UI Kit (Design System)
       implementation(projects.frontend.core.designSystem)
-
-      // Generic Delta-Sync core
       implementation(projects.frontend.core.sync)
-
-      // Local DB (SQLDelight)
       implementation(projects.frontend.core.localDb)
-      implementation(libs.sqldelight.coroutines) // Explicitly add coroutines extension for async driver support
+      implementation(libs.sqldelight.coroutines)
+      implementation(projects.frontend.core.domain)
 
-      // Shared sync contract base (Syncable)
-      implementation(projects.core.coreDomain)
-
-      // Compose dependencies
       implementation(compose.foundation)
       implementation(compose.runtime)
       implementation(compose.material3)
@@ -62,12 +38,10 @@ kotlin {
       implementation(compose.components.resources)
       implementation(compose.materialIconsExtended)
 
-      // Bundles (Cleaned up dependencies)
-      implementation(libs.bundles.kmp.common)        // Coroutines, Serialization, DateTime
-      implementation(libs.bundles.ktor.client.common) // Ktor Client (Core, Auth, JSON, Logging)
-      implementation(libs.bundles.compose.common)     // ViewModel & Lifecycle
+      implementation(libs.bundles.kmp.common)
+      implementation(libs.bundles.ktor.client.common)
+      implementation(libs.bundles.compose.common)
 
-      // DI (Koin) for resolving apiClient from container
       implementation(libs.koin.core)
     }
 
@@ -78,7 +52,7 @@ kotlin {
     }
 
     jvmTest.dependencies {
-      implementation(libs.mockk) // MockK only for JVM tests
+      implementation(libs.mockk)
       implementation(projects.platform.platformTesting)
       implementation(libs.bundles.testing.jvm)
     }
@@ -90,22 +64,9 @@ kotlin {
     jsMain.dependencies {
       implementation(libs.ktor.client.js)
     }
-
-    /*
-    val wasmJsMain = getByName("wasmJsMain")
-    wasmJsMain.dependencies {
-      implementation(libs.ktor.client.js) // WASM verwendet JS-Client [cite: 7]
-
-      // Compose für shared UI components für WASM
-      implementation(compose.runtime)
-      implementation(compose.foundation)
-      implementation(compose.material3)
-    }
-    */
   }
 }
 
-// KMP Compile-Optionen
 tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
   compilerOptions {
     jvmTarget.set(JvmTarget.JVM_25)

frontend/features/ping-feature/src/commonTest/kotlin/at/mocode/ping/feature/test/Fakes.kt

@@ -132,8 +132,8 @@ class TestPingApiClient : PingApi {
     return handleRequest(securePingResponse)
   }
 
-  override suspend fun syncPings(lastSyncTimestamp: Long): List<PingEvent> {
-    syncPingsCalledWith = lastSyncTimestamp
+  override suspend fun syncPings(since: Long): List<PingEvent> {
+    syncPingsCalledWith = since
     callCount++
 
     if (simulateDelay) {