feat: add thumbnail timeout and low-memory warning

server/utils/system-resources.ts

@@ -0,0 +1,42 @@
+import { readFileSync } from 'node:fs'
+import { totalmem } from 'node:os'
+
+export const LOW_MEMORY_THRESHOLD_BYTES = 2 * 1024 * 1024 * 1024
+
+export function isLowMemory(bytes: number): boolean {
+  return bytes > 0 && bytes < LOW_MEMORY_THRESHOLD_BYTES
+}
+
+function readCgroupMemoryLimit(): number | null {
+  for (const path of [
+    '/sys/fs/cgroup/memory.max',
+    '/sys/fs/cgroup/memory/memory.limit_in_bytes'
+  ]) {
+    try {
+      const raw = readFileSync(path, 'utf8').trim()
+      if (!raw || raw === 'max') continue
+      const value = Number(raw)
+      if (Number.isFinite(value) && value > 0) return value
+    } catch {
+      // The current platform may not use cgroup memory limits.
+    }
+  }
+  return null
+}
+
+export function detectSystemMemory(): {
+  totalBytes: number
+  lowMemory: boolean
+  thresholdBytes: number
+} {
+  const hostMemory = totalmem()
+  const cgroupLimit = readCgroupMemoryLimit()
+  const totalBytes = cgroupLimit
+    ? Math.min(hostMemory, cgroupLimit)
+    : hostMemory
+  return {
+    totalBytes,
+    lowMemory: isLowMemory(totalBytes),
+    thresholdBytes: LOW_MEMORY_THRESHOLD_BYTES
+  }
+}