feat: implement auth system, passkeys, and user management

Add PostgreSQL and Redis integration for users and sessions
Implement password and WebAuthn passkey login flows
Add Docker stack, super-admin seeding, and protected routes

app/composables/useApiClient.ts

@@ -0,0 +1,10 @@
+export function useApiClient() {
+  return async function apiClient<T>(url: string, options?: Parameters<typeof $fetch<T>>[1]) {
+    if (import.meta.server) {
+      const requestFetch = useRequestFetch()
+      return await requestFetch<T>(url, options)
+    }
+
+    return await $fetch<T>(url, options)
+  }
+}