Update backup system and local changes

- BorgBackup disaster recovery system
- Health endpoint updates
- Merged with remote changes

src/routes/health.ts.backup

@@ -0,0 +1,21 @@
+import { Router } from "express";
+import { getPoolStats } from "../services/browser.js";
+
+export const healthRouter = Router();
+
+healthRouter.get("/", (_req, res) => {
+  const pool = getPoolStats();
+  res.json({
+    status: "ok",
+    version: "0.2.1",
+    pool: {
+      size: pool.poolSize,
+      active: pool.totalPages - pool.availablePages,
+      available: pool.availablePages,
+      queueDepth: pool.queueDepth,
+      pdfCount: pool.pdfCount,
+      restarting: pool.restarting,
+      uptimeSeconds: Math.round(pool.uptimeMs / 1000),
+    },
+  });
+});