Refactor backend to SQLModel; reset schema; add Company OS endpoints

frontend/src/lib/api.ts

@@ -0,0 +1,24 @@
+export function apiUrl(path: string) {
+  const base = process.env.NEXT_PUBLIC_API_URL;
+  if (!base) throw new Error("NEXT_PUBLIC_API_URL is not set");
+  return `${base}${path}`;
+}
+
+export async function apiGet<T>(path: string): Promise<T> {
+  const res = await fetch(apiUrl(path), { cache: "no-store" });
+  if (!res.ok) throw new Error(`GET ${path} failed (${res.status})`);
+  return (await res.json()) as T;
+}
+
+export async function apiSend<T>(
+  path: string,
+  opts: { method: "POST" | "PATCH" | "DELETE"; body?: unknown }
+): Promise<T> {
+  const res = await fetch(apiUrl(path), {
+    method: opts.method,
+    headers: opts.body ? { "Content-Type": "application/json" } : undefined,
+    body: opts.body ? JSON.stringify(opts.body) : undefined,
+  });
+  if (!res.ok) throw new Error(`${opts.method} ${path} failed (${res.status})`);
+  return (await res.json()) as T;
+}