feat: add Cursor usage quota tracking

Adds Cursor as a supported quota provider
Reads Cursor auth from env, token files, or local app data
Improves Cursor usage labels in the UI

packages/web/server/lib/quota/providers/index.js

@@ -10,6 +10,7 @@ import { buildResult } from '../utils/index.js';
 import * as claude from './claude.js';
 import * as codex from './codex.js';
 import * as copilot from './copilot.js';
+import * as cursor from './cursor.js';
 import * as google from './google/index.js';
 import * as kimi from './kimi.js';
 import * as nanogpt from './nanogpt.js';
@@ -35,6 +36,12 @@ const registry = {
     isConfigured: codex.isConfigured,
     fetchQuota: codex.fetchQuota
   },
+  cursor: {
+    providerId: cursor.providerId,
+    providerName: cursor.providerName,
+    isConfigured: cursor.isConfigured,
+    fetchQuota: cursor.fetchQuota
+  },
   google: {
     providerId: 'google',
     providerName: 'Google',
@@ -155,6 +162,7 @@ export const fetchClaudeQuota = claude.fetchQuota;
 export const fetchOpenaiQuota = openai.fetchQuota;
 export const fetchGoogleQuota = google.fetchGoogleQuota;
 export const fetchCodexQuota = codex.fetchQuota;
+export const fetchCursorQuota = cursor.fetchQuota;
 export const fetchCopilotQuota = copilot.fetchQuota;
 export const fetchCopilotAddonQuota = copilot.fetchQuotaAddon;
 export const fetchKimiQuota = kimi.fetchQuota;