fix(usage): guard malformed DeepSeek payloads (#110785)

Co-authored-by: Leon-SK668 <17695126+Leon-SK668@users.noreply.github.com>

src/infra/provider-usage.fetch.deepseek.test.ts

@@ -85,6 +85,18 @@ describe("fetchDeepSeekUsage", () => {
     expect(result.windows).toHaveLength(0);
   });
 
+  it.each([
+    ["null response", null],
+    ["array response", []],
+  ])("treats %s as absent balance data", async (_name, payload) => {
+    const mockFetch = createProviderUsageFetch(async () => makeResponse(200, payload));
+
+    const result = await fetchDeepSeekUsage("deepseek-key", 5000, mockFetch);
+
+    expect(result.error).toBe("No balance data");
+    expect(result.windows).toHaveLength(0);
+  });
+
   it("marks unavailable accounts while keeping the balance summary", async () => {
     const mockFetch = createProviderUsageFetch(async () =>
       makeResponse(200, {

src/infra/provider-usage.fetch.deepseek.ts

@@ -1,4 +1,5 @@
 // Fetches and normalizes DeepSeek provider usage records.
+import { isRecord } from "@openclaw/normalization-core/record-coerce";
 import {
   buildUsageHttpErrorSnapshot,
   discardUsageResponseBody,
@@ -86,8 +87,8 @@ export async function fetchDeepSeekUsage(
     return parsed.snapshot;
   }
 
-  const data = parsed.data as DeepSeekBalanceResponse;
-  const balances = Array.isArray(data.balance_infos) ? data.balance_infos : [];
+  const data = isRecord(parsed.data) ? (parsed.data as DeepSeekBalanceResponse) : undefined;
+  const balances = data && Array.isArray(data.balance_infos) ? data.balance_infos : [];
   const summary = balances
     .map((info) => buildBalanceSummary(info))
     .filter((entry): entry is string => Boolean(entry))
@@ -120,6 +121,6 @@ export async function fetchDeepSeekUsage(
     windows: [],
     billing,
     summary,
-    ...(data.is_available === false ? { plan: "Unavailable" } : {}),
+    ...(data?.is_available === false ? { plan: "Unavailable" } : {}),
   };
 }