chore: refactor Gradle config, standardize Kotlin MPP plugin usage, and update dependencies

- Unified plugin application across modules using `alias(libs.plugins.*)` instead of hardcoded IDs.
- Removed redundant JVM/JS source map tasks, improving Gradle and Docker build consistency.
- Updated dependencies, including `logback` and Webpack `copy-webpack-plugin`, and added contextual documentation.
- Added frontend architecture diagram in PlantUML (`docs/01_Architecture/Reference`), standardizing feature-core-shell dependencies.

contracts/ping-api/build.gradle.kts

@@ -1,41 +1,37 @@
 plugins {
-    // Fix for "Plugin loaded multiple times": Apply plugin by ID without version (inherited from root)
-    id("org.jetbrains.kotlin.multiplatform")
-    alias(libs.plugins.kotlinSerialization)
+  alias(libs.plugins.kotlinMultiplatform)
+  alias(libs.plugins.kotlinSerialization)
 }
 
 group = "at.mocode"
 version = "1.0.0"
 
 kotlin {
-    // Toolchain is now handled centrally in the root build.gradle.kts
+  // JVM target for backend usage
+  jvm()
 
-    // JVM target for backend usage
-    jvm()
+  // JS target for frontend usage (Compose/Browser)
+  js {
+    browser()
+  }
 
-    // JS target for frontend usage (Compose/Browser)
-    js {
-        browser()
-        // no need for binaries.executable() in a library
+  // Wasm enabled by default
+  @OptIn(org.jetbrains.kotlin.gradle.ExperimentalWasmDsl::class)
+  wasmJs {
+    browser()
+  }
+
+  sourceSets {
+    commonMain {
+      dependencies {
+        api(projects.core.coreDomain) // Changed from implementation to api to export Syncable
+        implementation(libs.kotlinx.serialization.json)
+      }
     }
-
-    // Wasm enabled by default
-    @OptIn(org.jetbrains.kotlin.gradle.ExperimentalWasmDsl::class)
-    wasmJs {
-        browser()
-    }
-
-    sourceSets {
-        commonMain {
-            dependencies {
-                api(projects.core.coreDomain) // Changed from implementation to api to export Syncable
-                implementation(libs.kotlinx.serialization.json)
-            }
-        }
-        commonTest {
-            dependencies {
-                implementation(libs.kotlin.test)
-            }
-        }
+    commonTest {
+      dependencies {
+        implementation(libs.kotlin.test)
+      }
     }
+  }
 }