fix: minimize codex upstream headers and clean quota wording

src/server/services/oauth/quota.test.ts

@@ -76,7 +76,7 @@ describe('oauth quota snapshot helpers', () => {
     expect(snapshot).toEqual({
       status: 'unsupported',
       source: 'official',
-      providerMessage: 'current local CLIProxyAPI evidence does not expose official quota windows for antigravity oauth',
+      providerMessage: 'official quota windows are not exposed for antigravity oauth',
       windows: {
         fiveHour: {
           supported: false,

src/server/services/oauth/quota.ts

@@ -54,7 +54,7 @@ function buildProviderUnsupportedSnapshot(provider: string): OauthQuotaSnapshot
   return {
     status: 'unsupported',
     source: 'official',
-    providerMessage: `current local CLIProxyAPI evidence does not expose official quota windows for ${provider} oauth`,
+    providerMessage: `official quota windows are not exposed for ${provider} oauth`,
     windows: {
       fiveHour: buildUnsupportedWindow('official 5h quota window is unavailable for this provider'),
       sevenDay: buildUnsupportedWindow('official 7d quota window is unavailable for this provider'),