pm2: add crash-loop governor and set cwd for linkweb

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

ecosystem.config.cjs

@@ -1,7 +1,18 @@
+// Crash-loop governor: after max_restarts attempts that each fail to stay up
+// min_uptime ms, PM2 marks the app `errored` and stops relaunching it, instead
+// of restarting forever and pegging the CPU.
+const RESTART_POLICY = {
+  max_restarts: 10,
+  min_uptime: 10000,
+  exp_backoff_restart_delay: 200,
+};
+
 module.exports = {
   apps: [
     {
       name: 'linkweb',
+      ...RESTART_POLICY,
+      cwd: __dirname,
       script: 'server.js',
       env: {
         NODE_ENV: 'production',