Convert components to standalone and implement route-based loading

Refactored Angular components to standalone modules, enhancing modularity and reducing dependency on `AppModule`. Updated routes to facilitate lazy loading for improved performance and maintainability. Replaced `platformBrowserDynamic` with `bootstrapApplication` for modern bootstrapping.

frontend/build.gradle.kts

@@ -0,0 +1,14 @@
+tasks.register<Exec>("npmInstall") {
+  commandLine("npm.cmd", "install")
+//    commandLine("npm", "install")
+}
+
+tasks.register<Exec>("ngBuild") {
+  dependsOn("npmInstall", "generateFrontendApi")
+//    commandLine("npm", "run", "build")
+  commandLine("npm.cmd", "run", "build")
+}
+
+//dependencies {
+//  implementation(project(":backend"))
+//}