feat(proxy): add edit and delete functionality for proxies

- Add new API endpoints for modifying and deleting proxies
- Implement UI components for edit and delete actions
- Update proxy form to handle both create and edit modes
- Add confirmation modal for delete operation

src/styles/common.css

@@ -539,6 +539,12 @@
     transition: color 0.3s;
 }
 
+.proxy-actions-right {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+}
+
 .proxy-type {
     display: inline-block;
     padding: 4px 12px;
@@ -607,3 +613,13 @@
     outline: none;
     border-color: var(--primary-color);
 }
+
+.proxy-actions {
+    display: flex;
+    gap: 8px;
+}
+
+.proxy-actions .common-btn {
+    padding: 6px 12px;
+    font-size: 12px;
+}