Initial project skeleton

Haskell backend: Orb HTTP framework, JSON-only API
Frontend: Mithril.js SPA with TypeScript, Neo Brutalism CSS
Dockerized build via flipstone/haskell-tools image

Routes:
  GET /api/health — health check

Build: ./hs stack build
Test:  ./hs stack test
Run:   ./scripts/run

frontend/src/api.ts

@@ -0,0 +1,21 @@
+/**
+ * Thin API client for the Sis backend.
+ */
+
+const BASE = "/api";
+
+async function request<T>(path: string): Promise<T> {
+  const resp = await fetch(BASE + path);
+  if (!resp.ok) {
+    throw new Error(`HTTP ${resp.status}: ${resp.statusText}`);
+  }
+  return resp.json() as Promise<T>;
+}
+
+export interface HealthResponse {
+  message: string;
+}
+
+export function checkHealth(): Promise<string> {
+  return request<HealthResponse>("/health").then((r) => r.message);
+}