feat: upgrade to V1.2 - Tags, Click Stats, and Robust WebDAV

- add Tagging system (backend and frontend)
- add Click count statistics and redirection logic
- add config.example.py
- fix WebDAV MKCOL 405 error and response handling
- fix redirection loop during force password change
- audit SQL queries for security

templates/admin/services.html

@@ -46,6 +46,11 @@
                     <input type="text" id="serviceDesc" class="input" placeholder="简短描述">
                 </div>
 
+                <div class="form-group">
+                    <label>标签 (英文逗号分隔)</label>
+                    <input type="text" id="serviceTags" class="input" placeholder="工具, 开发, 常用">
+                </div>
+
                 <div class="form-row">
                     <div class="form-group">
                         <label>图标（emoji）</label>
@@ -593,6 +598,7 @@
         document.getElementById('serviceName').value = service.name;
         document.getElementById('serviceUrl').value = service.url;
         document.getElementById('serviceDesc').value = service.description || '';
+        document.getElementById('serviceTags').value = service.tags || '';
         document.getElementById('serviceIcon').value = service.icon || '';
         document.getElementById('serviceCategory').value = service.category;
         document.getElementById('serviceSort').value = service.sort_order;
@@ -611,6 +617,7 @@
             name: document.getElementById('serviceName').value,
             url: document.getElementById('serviceUrl').value,
             description: document.getElementById('serviceDesc').value,
+            tags: document.getElementById('serviceTags').value,
             icon: document.getElementById('serviceIcon').value,
             category: document.getElementById('serviceCategory').value,
             sort_order: parseInt(document.getElementById('serviceSort').value) || 0,