feat: consolidate /accounts into /account-limits endpoint

- Remove redundant /accounts endpoint
- Enhance /account-limits table output with account status, last used time, and quota reset time
- Filter model list to show only Claude models
- Use local time format for timestamps
- Update documentation (README.md, CLAUDE.md, index.js)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/cloudcode-client.js

@@ -947,8 +947,72 @@ export function listModels() {
     };
 }
 
+/**
+ * Fetch available models with quota info from Cloud Code API
+ * Returns model quotas including remaining fraction and reset time
+ *
+ * @param {string} token - OAuth access token
+ * @returns {Promise<Object>} Raw response from fetchAvailableModels API
+ */
+export async function fetchAvailableModels(token) {
+    const headers = {
+        'Authorization': `Bearer ${token}`,
+        'Content-Type': 'application/json',
+        ...ANTIGRAVITY_HEADERS
+    };
+
+    for (const endpoint of ANTIGRAVITY_ENDPOINT_FALLBACKS) {
+        try {
+            const url = `${endpoint}/v1internal:fetchAvailableModels`;
+            const response = await fetch(url, {
+                method: 'POST',
+                headers,
+                body: JSON.stringify({})
+            });
+
+            if (!response.ok) {
+                const errorText = await response.text();
+                console.log(`[CloudCode] fetchAvailableModels error at ${endpoint}: ${response.status}`);
+                continue;
+            }
+
+            return await response.json();
+        } catch (error) {
+            console.log(`[CloudCode] fetchAvailableModels failed at ${endpoint}:`, error.message);
+        }
+    }
+
+    throw new Error('Failed to fetch available models from all endpoints');
+}
+
+/**
+ * Get model quotas for an account
+ * Extracts quota info (remaining fraction and reset time) for each model
+ *
+ * @param {string} token - OAuth access token
+ * @returns {Promise<Object>} Map of modelId -> { remainingFraction, resetTime }
+ */
+export async function getModelQuotas(token) {
+    const data = await fetchAvailableModels(token);
+    if (!data || !data.models) return {};
+
+    const quotas = {};
+    for (const [modelId, modelData] of Object.entries(data.models)) {
+        if (modelData.quotaInfo) {
+            quotas[modelId] = {
+                remainingFraction: modelData.quotaInfo.remainingFraction ?? null,
+                resetTime: modelData.quotaInfo.resetTime ?? null
+            };
+        }
+    }
+
+    return quotas;
+}
+
 export default {
     sendMessage,
     sendMessageStream,
-    listModels
+    listModels,
+    fetchAvailableModels,
+    getModelQuotas
 };