支持gimini格式，优化debug日志

static/admin.css

@@ -59,6 +59,7 @@ main{padding:28px 0 60px}
 .tag-anthropic{background:rgba(249,115,22,.15);color:#fb923c}
 .tag-openai{background:rgba(16,185,129,.15);color:#34d399}
 .tag-responses{background:rgba(59,130,246,.15);color:#60a5fa}
+.tag-gemini{background:rgba(66,133,244,.15);color:#4285f4}
 .tag-auto{background:rgba(139,92,246,.15);color:#a78bfa}
 .tag-override{background:rgba(59,130,246,.1);color:var(--primary)}
 .tag-instructions{background:rgba(234,179,8,.15);color:var(--yellow)}
@@ -66,6 +67,11 @@ main{padding:28px 0 60px}
 .mapping-actions{margin-left:auto;display:flex;gap:6px}
 .empty{text-align:center;padding:40px;color:var(--muted)}
 
+.stats-table{width:100%;border-collapse:collapse;font-size:13px}
+.stats-table th{text-align:left;color:var(--muted);font-weight:500;padding:8px 12px;border-bottom:1px solid var(--border)}
+.stats-table td{padding:8px 12px;border-bottom:1px solid var(--border)}
+.stats-table tr:hover{background:var(--surface)}
+
 .modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:100;align-items:center;justify-content:center}
 .modal-overlay.active{display:flex}
 .modal{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:28px;width:520px;max-width:90vw;max-height:85vh;overflow-y:auto;box-shadow:0 20px 60px rgba(0,0,0,.5)}

static/admin.html

@@ -70,6 +70,15 @@
       </div>
       <div id="mappingList"></div>
     </div>
+
+    <!-- 用量统计 -->
+    <div class="card">
+      <div class="card-header">
+        <h2>用量统计</h2>
+        <button class="btn btn-ghost btn-sm" onclick="loadStats()">刷新</button>
+      </div>
+      <div id="statsContent"><div class="empty">加载中…</div></div>
+    </div>
   </main>
 </div>
 
@@ -95,13 +104,15 @@
           <option value="anthropic">Anthropic (/v1/messages)</option>
           <option value="openai">OpenAI (/v1/chat/completions)</option>
           <option value="responses">OpenAI Responses (/v1/responses)</option>
+          <option value="gemini">Gemini (generateContent)</option>
         </select>
       </div>
       <div class="hint">
         <b>anthropic</b>：转换为 Anthropic Messages 格式 — 适用于中转站通过 <code>/v1/messages</code> 提供 Claude 模型<br>
         <b>openai</b>：保持 OpenAI Chat Completions 格式 — 适用于 GPT、DeepSeek、Codex 或通过 <code>/v1/chat/completions</code> 提供所有模型的中转站<br>
         <b>responses</b>：保持 OpenAI Responses 格式 — 适用于中转站仅通过 <code>/v1/responses</code> 提供模型能力<br>
-        <b>自动检测</b>：根据上游模型名判断（含 claude → anthropic，其他 → openai）
+        <b>gemini</b>：转换为 Gemini Contents 格式 — 适用于 Google Gemini API 或兼容的中转站<br>
+        <b>自动检测</b>：根据上游模型名判断（含 claude → anthropic，含 gemini → gemini，其他 → openai）
       </div>
     </div>
     <div class="field">

static/admin.js

@@ -70,11 +70,39 @@ async function loadDashboard() {
     document.getElementById('envKey').textContent = s.env_api_key ? '环境变量: (已配置)' : '环境变量: (未设置)';
     await loadMappings();
     checkHealth();
+    loadStats();
   } catch (e) {
     toast('加载设置失败: ' + e.message, false);
   }
 }
 
+async function loadStats() {
+  const el = document.getElementById('statsContent');
+  try {
+    const data = await api('/api/admin/stats');
+    const models = data.models || {};
+    const keys = Object.keys(models);
+    if (!keys.length) {
+      el.innerHTML = '<div class="empty">暂无请求统计数据</div>';
+      return;
+    }
+    const uptime = data.uptime_seconds || 0;
+    const h = Math.floor(uptime / 3600);
+    const m = Math.floor((uptime % 3600) / 60);
+    let html = '<div class="hint" style="margin-bottom:12px">运行时长: ' + h + '小时' + m + '分钟</div>';
+    html += '<table class="stats-table"><thead><tr><th>模型</th><th>请求数</th><th>输入 Tokens</th><th>输出 Tokens</th><th>总 Tokens</th></tr></thead><tbody>';
+    keys.sort((a, b) => models[b].request_count - models[a].request_count);
+    for (const name of keys) {
+      const s = models[name];
+      html += '<tr><td>' + esc(name) + '</td><td>' + s.request_count + '</td><td>' + s.input_tokens.toLocaleString() + '</td><td>' + s.output_tokens.toLocaleString() + '</td><td>' + s.total_tokens.toLocaleString() + '</td></tr>';
+    }
+    html += '</tbody></table>';
+    el.innerHTML = html;
+  } catch (e) {
+    el.innerHTML = '<div class="empty">加载统计失败</div>';
+  }
+}
+
 async function checkHealth() {
   try {
     const r = await fetch(API + '/health');
@@ -130,7 +158,9 @@ async function loadMappings() {
         ? 'tag-responses'
         : backend === 'openai'
           ? 'tag-openai'
-          : 'tag-auto';
+          : backend === 'gemini'
+            ? 'tag-gemini'
+            : 'tag-auto';
     const tagLabel = backend === 'auto'
       ? '自动'
       : backend === 'responses'