添加供应商编辑功能和密码显示切换

- 为供应商列表添加启用和编辑按钮
- 创建EditProviderModal组件支持编辑供应商信息
- 实现updateProvider API接口
- 为API Key输入框添加密码显示/隐藏功能，使用SVG图标
- 更新预设供应商配置为YesCode和PackyCode
- 移除model字段，简化供应商配置

src/renderer/components/AddProviderModal.css

@@ -20,6 +20,8 @@
   max-height: 90vh;
   overflow-y: auto;
   box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
+  position: relative;
+  z-index: 1001;
 }
 
 .modal-content h2 {
@@ -79,6 +81,9 @@
   border-radius: 4px;
   font-size: 0.95rem;
   transition: border-color 0.2s;
+  position: relative;
+  z-index: 1;
+  background: white;
 }
 
 .form-group input:focus {
@@ -119,4 +124,47 @@
 
 .submit-btn:hover {
   background: #229954;
+}
+
+.password-input-wrapper {
+  position: relative;
+  display: flex;
+  align-items: center;
+}
+
+.password-input-wrapper input {
+  padding-right: 2.5rem;
+}
+
+.password-toggle {
+  position: absolute;
+  right: 0.5rem;
+  top: 50%;
+  transform: translateY(-50%);
+  padding: 0.375rem;
+  background: none;
+  border: none;
+  cursor: pointer;
+  color: #7f8c8d;
+  transition: color 0.2s;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 32px;
+  height: 32px;
+  z-index: 2;
+}
+
+.password-toggle svg {
+  width: 20px;
+  height: 20px;
+  stroke-width: 2;
+}
+
+.password-toggle:hover {
+  color: #3498db;
+}
+
+.password-toggle:focus {
+  outline: none;
 }