Adds front-end set-up

frontend/src/vite-env.d.ts

@@ -0,0 +1,13 @@
+/// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+    /** Base URL of the SlpModularCms .NET API (e.g. http://localhost:5000). */
+    readonly VITE_API_BASE_URL: string;
+    /** Set to 'true' to run the MSW mock backend in the browser during dev. */
+    readonly VITE_ENABLE_MSW?: string;
+    // Add future typed env flags here.
+}
+
+interface ImportMeta {
+    readonly env: ImportMetaEnv;
+}