Show TRC20 USDT pay address on the license page.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/license/templates/license.html

@@ -43,6 +43,24 @@
       font-family: ui-monospace, Consolas, monospace;
       font-size: 0.85rem;
     }
+    .pay-box {
+      margin-bottom: 16px;
+      padding: 12px;
+      border-radius: 10px;
+      border: 1px solid #2a3a2a;
+      background: #0e1610;
+    }
+    .pay-box .pay-title { font-size: 0.85rem; color: #9fe0b8; margin-bottom: 8px; }
+    .pay-row { display: flex; gap: 8px; align-items: stretch; }
+    .pay-row .id { flex: 1; }
+    .pay-row button {
+      width: auto;
+      margin: 0;
+      padding: 8px 12px;
+      flex-shrink: 0;
+      background: #2a4a36;
+      font-size: 0.85rem;
+    }
     input[type=text], input[type=password] {
       width: 100%;
       padding: 10px 12px;
@@ -75,6 +93,17 @@
     <h1>软件授权</h1>
     <p class="muted">复制设备 ID，联系微信 <strong>{{ wechat }}</strong> 获取 <strong>客户密钥</strong> 与激活码。授权站：{{ api_url }}</p>
 
+    {% if usdt_address %}
+    <div class="pay-box">
+      <div class="pay-title">USDT 收款地址（{{ usdt_network or 'TRC20' }}）</div>
+      <div class="pay-row">
+        <div class="id" id="usdtAddress">{{ usdt_address }}</div>
+        <button type="button" id="copyUsdtBtn">复制</button>
+      </div>
+      <div class="hint">仅支持 {{ usdt_network or 'TRC20' }} 网络，转错链无法找回。年卡 1000 USDT + 部署费 100 USDT。</div>
+    </div>
+    {% endif %}
+
     {% if message %}<p class="ok">{{ message }}</p>{% endif %}
     {% if error %}<p class="err">{{ error }}</p>{% endif %}
 
@@ -102,5 +131,28 @@
       套餐：{{ status.plan or '—' }}　到期：{{ status.expires_at or '—' }}
     </div>
   </div>
+  <script>
+    (function () {
+      var btn = document.getElementById("copyUsdtBtn");
+      var el = document.getElementById("usdtAddress");
+      if (!btn || !el) return;
+      btn.addEventListener("click", function () {
+        var text = (el.textContent || "").trim();
+        if (!text) return;
+        var done = function () {
+          var old = btn.textContent;
+          btn.textContent = "已复制";
+          setTimeout(function () { btn.textContent = old; }, 1500);
+        };
+        if (navigator.clipboard && navigator.clipboard.writeText) {
+          navigator.clipboard.writeText(text).then(done).catch(function () {
+            window.prompt("复制地址", text);
+          });
+        } else {
+          window.prompt("复制地址", text);
+        }
+      });
+    })();
+  </script>
 </body>
 </html>