fix: extract string from rate-limit error object to prevent React crash

bioai-platform/frontend/src/app/(dashboard)/analyze/admet/page.tsx

@@ -32,7 +32,7 @@ export default function ADMETPage() {
       const res = await computeADMET(smiles.trim());
       setResult(res.result);
     } catch (e: any) {
-      setError(e?.response?.data?.detail || e.message || "Computation failed");
+      setError(typeof e?.response?.data?.detail === "string" ? e.response.data.detail : e?.response?.data?.detail?.message || e.message || "Computation failed");
     } finally {
       setLoading(false);
     }

bioai-platform/frontend/src/app/(dashboard)/analyze/function/page.tsx

@@ -56,7 +56,7 @@ export default function FunctionPage() {
       setJobId(res.job_id);
       setStatus(res.status);
     } catch (e: any) {
-      setError(e?.response?.data?.detail || e.message || "Submission failed");
+      setError(typeof e?.response?.data?.detail === "string" ? e.response.data.detail : e?.response?.data?.detail?.message || e.message || "Submission failed");
       setLoading(false);
     }
   };

bioai-platform/frontend/src/app/(dashboard)/analyze/md/page.tsx

@@ -57,7 +57,7 @@ export default function MDPage() {
       setJobId(res.job_id);
       setStatus(res.status);
     } catch (e: any) {
-      setError(e?.response?.data?.detail || e.message || "Submission failed");
+      setError(typeof e?.response?.data?.detail === "string" ? e.response.data.detail : e?.response?.data?.detail?.message || e.message || "Submission failed");
       setLoading(false);
     }
   };