fix(cliproxy): harden Claude OAuth quota window parsing

tests/unit/cliproxy/account-safety-quota-exhaustion.test.ts

@@ -253,7 +253,7 @@ describe('Quota Exhaustion Handlers', () => {
       expect(result.reason).toContain('no alternatives');
     });
 
-    it('should switch Claude accounts when fallback quota is unavailable but auth is valid', async () => {
+    it('should switch Claude accounts when fallback quota endpoint returns 404', async () => {
       writeRegistry({
         claude: {
           default: 'exhausted@example.com',
@@ -294,16 +294,7 @@ describe('Quota Exhaustion Handlers', () => {
       global.fetch = mock((_url: string, options?: RequestInit) => {
         const authHeader = new Headers(options?.headers).get('Authorization') ?? '';
         if (authHeader === 'Bearer fallback-token') {
-          return Promise.resolve(
-            new Response(
-              JSON.stringify({
-                error: {
-                  message: 'OAuth authentication is currently not supported.',
-                },
-              }),
-              { status: 401, headers: { 'Content-Type': 'application/json' } }
-            )
-          );
+          return Promise.resolve(new Response('', { status: 404 }));
         }
 
         return Promise.resolve(new Response('', { status: 500 }));

tests/unit/cliproxy/quota-fetcher-claude.test.ts

@@ -182,6 +182,20 @@ describe('Claude Quota Fetcher', () => {
       expect(windows[1].rateLimitType).toBe('seven_day_sonnet');
       expect(windows[1].remainingPercent).toBe(91);
     });
+
+    it('parses future OAuth usage windows without hardcoded keys', () => {
+      const windows = buildClaudeQuotaWindows({
+        seven_day_haiku: {
+          utilization: 16,
+          resets_at: '2026-03-06T10:00:00Z',
+        },
+      });
+
+      expect(windows).toHaveLength(1);
+      expect(windows[0].rateLimitType).toBe('seven_day_haiku');
+      expect(windows[0].label).toBe('Seven Day Haiku');
+      expect(windows[0].remainingPercent).toBe(84);
+    });
   });
 
   describe('buildClaudeCoreUsageSummary', () => {