Add backend log management

lib/server/api.ts

@@ -1,11 +1,30 @@
 import { NextResponse } from "next/server";
+import { recordAppLog } from "@/lib/server/log-manager";
 
 export function jsonOk<T>(payload: T, init?: ResponseInit) {
   return NextResponse.json(payload, init);
 }
 
-export function jsonError(error: unknown, status = 400) {
+export type JsonErrorOptions = {
+  request?: Request;
+  source?: string;
+  details?: unknown;
+  logClientErrors?: boolean;
+};
+
+export async function jsonError(error: unknown, status = 400, options: JsonErrorOptions = {}) {
   const resolvedStatus = statusFromError(error) || status;
+  if (resolvedStatus >= 500 || options.logClientErrors) {
+    await recordAppLog({
+      level: resolvedStatus >= 500 ? "error" : "warning",
+      source: options.source || "api",
+      message: error instanceof Error ? error.message : String(error),
+      error,
+      status: resolvedStatus,
+      request: options.request,
+      details: options.details
+    }).catch(() => undefined);
+  }
   return NextResponse.json({
     error: error instanceof Error ? error.message : String(error)
   }, { status: resolvedStatus });