feat(upload): #13 添加上传至sub2api

templates/accounts.html

@@ -131,6 +131,9 @@
                         <button class="btn btn-info" id="batch-check-sub-btn" disabled title="批量检测订阅状态">
                             🔍 检测订阅
                         </button>
+                        <button class="btn btn-info" id="batch-upload-sub2api-btn" disabled title="批量上传到Sub2API">
+                            🔗 上传Sub2API
+                        </button>
                         <button class="btn btn-success" id="batch-upload-tm-btn" disabled title="批量上传到Team Manager">
                             🚀 上传TM
                         </button>
@@ -233,6 +236,26 @@
         </div>
     </div>
 
+    <!-- Sub2API 服务选择模态框 -->
+    <div class="modal" id="sub2api-service-modal">
+        <div class="modal-content" style="max-width: 480px;">
+            <div class="modal-header">
+                <h3>🔗 选择 Sub2API 服务</h3>
+                <button class="modal-close" id="close-sub2api-modal">&times;</button>
+            </div>
+            <div class="modal-body">
+                <p style="color: var(--text-muted); margin-bottom: 12px; font-size: 0.9rem;">选择要上传到的 Sub2API 服务，或自动选择第一个启用的服务。</p>
+                <div id="sub2api-service-list" style="display: flex; flex-direction: column; gap: 8px; max-height: 300px; overflow-y: auto;">
+                    <div style="text-align: center; color: var(--text-muted);">加载中...</div>
+                </div>
+            </div>
+            <div class="modal-footer" style="padding: 12px 20px; border-top: 1px solid var(--border); display: flex; gap: 8px; justify-content: flex-end;">
+                <button class="btn btn-secondary" id="sub2api-use-auto-btn">自动选择</button>
+                <button class="btn btn-secondary" id="cancel-sub2api-modal-btn">取消</button>
+            </div>
+        </div>
+    </div>
+
     <script src="/static/js/utils.js"></script>
     <script src="/static/js/accounts.js"></script>
 </body>