chore: initialize monorepo with project scaffolding, configs, and CI setup

apps/explorer-web/src/config.ts

@@ -0,0 +1,14 @@
+export type DataMode = "mock" | "live";
+
+export interface ExplorerConfig {
+  dataMode: DataMode;
+  mockBasePath: string;
+  apiBaseUrl: string;
+}
+
+export const CONFIG: ExplorerConfig = {
+  // Toggle between "mock" (static JSON under public/mock/) and "live" coordinator APIs.
+  dataMode: (import.meta.env?.VITE_DATA_MODE as DataMode) ?? "mock",
+  mockBasePath: "/mock",
+  apiBaseUrl: import.meta.env?.VITE_COORDINATOR_API ?? "http://localhost:8000",
+};