Add provider background recovery lifecycle

AgentCompany-New/src/main/app/provider-background-worker.ts

@@ -0,0 +1,38 @@
+import type { BrowserWindow } from "electron";
+import type { DatabaseSync } from "node:sqlite";
+import { IPC_CHANNELS } from "../../shared/ipc";
+import { ProviderBackgroundService } from "../services/provider-background-service";
+
+const DEFAULT_INTERVAL_MS = 8_000;
+
+export interface ProviderBackgroundWorkerInput {
+  db: DatabaseSync;
+  mainWindow: BrowserWindow;
+  intervalMs?: number;
+}
+
+export function startProviderBackgroundWorker(input: ProviderBackgroundWorkerInput): () => void {
+  const service = new ProviderBackgroundService(input.db);
+  let running = false;
+  const intervalMs = input.intervalMs ?? DEFAULT_INTERVAL_MS;
+
+  const tick = async (): Promise<void> => {
+    if (running) return;
+    running = true;
+    try {
+      const changedCount = await service.recoverBackgroundResponses();
+      if (changedCount > 0 && !input.mainWindow.isDestroyed()) {
+        input.mainWindow.webContents.send(IPC_CHANNELS.rendererEvent, { type: "snapshot-changed" });
+      }
+    } finally {
+      running = false;
+    }
+  };
+
+  const interval = setInterval(() => {
+    void tick();
+  }, intervalMs);
+  void tick();
+
+  return () => clearInterval(interval);
+}