feat: /meta для версии в футере и устойчивый разбор JSON

frontend/src/app/layouts/AppShellFooter.tsx

@@ -1,22 +1,29 @@
 import { useEffect, useState } from "react";
-import { getHealth } from "../../api";
+import { getBackendMeta } from "../../api";
 import { FRONTEND_VERSION } from "../../frontendVersion";
 
+function isAbortError(error: unknown): boolean {
+  return (
+    (error instanceof DOMException && error.name === "AbortError") ||
+    (error instanceof Error && error.name === "AbortError")
+  );
+}
+
 export function AppShellFooter(): JSX.Element {
   const [backendVersion, setBackendVersion] = useState<string | null>(null);
 
   useEffect(() => {
     const ac = new AbortController();
-    void getHealth({ signal: ac.signal })
-      .then((h) => {
+    void getBackendMeta({ signal: ac.signal })
+      .then((meta) => {
         if (ac.signal.aborted) {
           return;
         }
-        const v = h.version;
+        const v = meta.version;
         setBackendVersion(typeof v === "string" && v.length > 0 ? v : "не указана");
       })
-      .catch(() => {
-        if (ac.signal.aborted) {
+      .catch((err) => {
+        if (ac.signal.aborted || isAbortError(err)) {
           return;
         }
         setBackendVersion("недоступна");