feat(quota): add Claude OAuth usage quota detection

Add Claude quota section to the Quota Management page, using the
Anthropic OAuth usage API (api.anthropic.com/api/oauth/usage) to
display utilization across all rate limit windows (5-hour, 7-day,
Opus, Sonnet, etc.) and extra usage credits.

src/pages/QuotaPage.tsx

@@ -10,6 +10,7 @@ import { authFilesApi, configFileApi } from '@/services/api';
 import {
   QuotaSection,
   ANTIGRAVITY_CONFIG,
+  CLAUDE_CONFIG,
   CODEX_CONFIG,
   GEMINI_CLI_CONFIG
 } from '@/components/quota';
@@ -69,6 +70,12 @@ export function QuotaPage() {
 
       {error && <div className={styles.errorBox}>{error}</div>}
 
+      <QuotaSection
+        config={CLAUDE_CONFIG}
+        files={files}
+        loading={loading}
+        disabled={disableControls}
+      />
       <QuotaSection
         config={ANTIGRAVITY_CONFIG}
         files={files}