feat: 产品卡片添加复制购买链接按钮

public/index.html

@@ -483,6 +483,28 @@
             cursor: pointer;
         }
         
+        .copy-link-btn {
+            background: rgba(0, 212, 255, 0.2);
+            border: 1px solid rgba(0, 212, 255, 0.5);
+            color: #00d4ff;
+            padding: 8px 16px;
+            border-radius: 8px;
+            font-size: 13px;
+            cursor: pointer;
+            transition: all 0.2s;
+            white-space: nowrap;
+        }
+
+        .copy-link-btn:hover {
+            background: rgba(0, 212, 255, 0.3);
+        }
+
+        .copy-link-btn.copied {
+            background: rgba(0, 255, 136, 0.2);
+            border-color: rgba(0, 255, 136, 0.5);
+            color: #00ff88;
+        }
+
         .alert-banner {
             background: linear-gradient(90deg, #ff6b6b, #ff8e53);
             padding: 15px;
@@ -675,6 +697,31 @@
             audio.currentTime = 0;
             audio.play().catch(e => console.log('音频播放需要用户交互'));
         }
+
+        function copyLink(url, btn) {
+            navigator.clipboard.writeText(url).then(() => {
+                btn.textContent = '已复制';
+                btn.classList.add('copied');
+                setTimeout(() => {
+                    btn.textContent = '复制链接';
+                    btn.classList.remove('copied');
+                }, 2000);
+            }).catch(() => {
+                // fallback
+                const input = document.createElement('input');
+                input.value = url;
+                document.body.appendChild(input);
+                input.select();
+                document.execCommand('copy');
+                document.body.removeChild(input);
+                btn.textContent = '已复制';
+                btn.classList.add('copied');
+                setTimeout(() => {
+                    btn.textContent = '复制链接';
+                    btn.classList.remove('copied');
+                }, 2000);
+            });
+        }
         
         function showAlertBanner(products) {
             const banner = document.getElementById('alertBanner');
@@ -1000,6 +1047,7 @@
                             ? '<span class="buy-btn sold-out">已售罄</span>'
                             : `<a href="${product.buyUrl || ACTIVITY_URL}" target="_blank" class="buy-btn">立即购买</a>`
                         }
+                        ${product.buyUrl ? `<button class="copy-link-btn" onclick="copyLink('${product.buyUrl}', this)">复制链接</button>` : ''}
                     </div>
                     <div class="product-monitor-checkbox">
                         <input type="checkbox" id="monitor-${product.id}"