feat(node): pair onboard computers with the Core fleet through UI

apps/control-station/src/core/fleet/useFleet.ts

@@ -0,0 +1,50 @@
+import { useCallback, useEffect, useState } from "react";
+
+export interface BoardHost {
+  hostname: string; os: string; architecture: string; cpus: number;
+  memory_kib: number | null; collected_at: string;
+  networks: { name: string; up: boolean; addresses: string[] }[];
+  usb: { port: string; product: string }[];
+}
+export interface Vehicle {
+  id: string; node_id: string; name: string; platform: string;
+  enrollment: "pending" | "paired" | "revoked" | "failed";
+  connectivity: "online" | "offline"; last_seen: number | null;
+  host: BoardHost | null; notice: string; revision: number;
+}
+export interface FleetPreview {
+  preview_id: string; node_id: string; name: string; host: BoardHost;
+  endpoint: string; expires_at: number;
+}
+export async function fleetRequest<T>(path = "", method = "GET", body?: unknown): Promise<T> {
+  const response = await fetch(`/api/v1/fleet${path}`, {
+    method, credentials: "same-origin", cache: "no-store",
+    headers: body === undefined ? {} : { "Content-Type": "application/json" },
+    body: body === undefined ? undefined : JSON.stringify(body), signal: AbortSignal.timeout(12000),
+  });
+  if (!response.ok) {
+    const data = await response.json().catch(() => ({}));
+    throw new Error(typeof data.detail === "string" ? data.detail : "Не удалось выполнить действие с аппаратом.");
+  }
+  return response.json();
+}
+export function useFleet() {
+  const [items, setItems] = useState<Vehicle[] | null>(null);
+  const [error, setError] = useState("");
+  const refresh = useCallback(async () => {
+    const value = await fleetRequest<{ items: Vehicle[] }>();
+    setItems(value.items); setError(""); return value.items;
+  }, []);
+  useEffect(() => {
+    let active = true;
+    let timer: ReturnType<typeof setTimeout>;
+    async function poll() {
+      try { const value = await fleetRequest<{ items: Vehicle[] }>(); if (active) { setItems(value.items); setError(""); } }
+      catch { if (active) setError("Реестр недоступен. Показаны последние полученные сведения; связь сейчас не подтверждена."); }
+      finally { if (active) timer = setTimeout(poll, 5000); }
+    }
+    void poll();
+    return () => { active = false; clearTimeout(timer); };
+  }, []);
+  return { items, error, refresh };
+}