perf: reduce resident dependencies and duplicate WebSocket authentication (#3071)

* perf: load HTTP dependencies only in the HTTP worker

* docs: record 30-minute idle resource comparison

* perf: isolate database initialization from the cluster primary

* docs: record isolated database startup resource comparison

* perf: avoid an extra shell child in Docker health probes

* perf: load notification dependencies only when needed

* perf: retain queue cleanup after notification loading comparison

* fix: stop page polling after unmount and avoid duplicate fetches

* perf: share WebSocket session polling across connections

* docs: measure real WebSocket container CPU and memory

* perf: reuse JWT validation within each WebSocket session check

* perf: bound login IP lookup allocations with an address cache

* refactor: limit resource optimization PR to three core changes

* docs: benchmark the three core optimizations against develop

* chore: remove documentation and benchmark artifacts from PR

back/bootstrap/database.ts

@@ -0,0 +1,26 @@
+import { errStack } from '../shared/errors';
+
+// Also terminate if the primary disappears without forwarding a signal.
+const onParentDisconnect = () => process.exit(1);
+process.once('disconnect', onParentDisconnect);
+
+async function initializeDatabase() {
+  const { sequelize } = await import('../data');
+  try {
+    const { default: loadDatabase } = await import('../loaders/db');
+    await loadDatabase();
+  } finally {
+    await sequelize.close();
+  }
+}
+
+initializeDatabase()
+  .catch((error) => {
+    console.error(`[boot] Database initialization failed:\n${errStack(error)}`);
+    process.exitCode = 1;
+  })
+  .finally(() => {
+    process.removeListener('disconnect', onParentDisconnect);
+    // Let pending log writes drain and exit naturally after closing SQLite.
+    if (process.connected) process.disconnect();
+  });