二次开发：补全 PRO 功能 + 优化体验

- 新增站点自定义（标题/Favicon/登录页描述）
- 新增在线自定义 CSS/JS 编辑器
- 扩展备份迁移支持面板配置导出导入
- 默认账号改为 admin/1234
- 设置按钮改为橙色更醒目
- 修复登录页误报"登录过期"弹窗
- 修复 i18n 双重 apps 块导致翻译失效

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

service/api/api_v1/system/A_ENTER.go

@@ -1,11 +1,13 @@
 package system
 
 type ApiSystem struct {
-	About           About
-	LoginApi        LoginApi
-	UserApi         UserApi
-	FileApi         FileApi
-	NoticeApi       NoticeApi
-	ModuleConfigApi ModuleConfigApi
-	MonitorApi      MonitorApi
+	About              About
+	LoginApi           LoginApi
+	UserApi            UserApi
+	FileApi            FileApi
+	NoticeApi          NoticeApi
+	ModuleConfigApi    ModuleConfigApi
+	MonitorApi         MonitorApi
+	SiteCustomizeApi   SiteCustomizeApi
+	CustomStyleApi     CustomStyleApi
 }

service/api/api_v1/system/customStyle.go

@@ -0,0 +1,33 @@
+package system
+
+import (
+	"sun-panel/api/api_v1/common/apiReturn"
+	"sun-panel/global"
+	"sun-panel/lib/cmn/systemSetting"
+
+	"github.com/gin-gonic/gin"
+	"github.com/gin-gonic/gin/binding"
+)
+
+type CustomStyleApi struct{}
+
+// 获取自定义 CSS/JS（无需登录）
+func (a *CustomStyleApi) Get(c *gin.Context) {
+	cfg := systemSetting.CustomStyle{}
+	global.SystemSetting.GetValueByInterface(systemSetting.CUSTOM_STYLE, &cfg)
+	apiReturn.SuccessData(c, cfg)
+}
+
+// 保存自定义 CSS/JS（管理员）
+func (a *CustomStyleApi) Set(c *gin.Context) {
+	cfg := systemSetting.CustomStyle{}
+	if err := c.ShouldBindBodyWith(&cfg, binding.JSON); err != nil {
+		apiReturn.ErrorParamFomat(c, err.Error())
+		return
+	}
+	if err := global.SystemSetting.Set(systemSetting.CUSTOM_STYLE, cfg); err != nil {
+		apiReturn.ErrorDatabase(c, err.Error())
+		return
+	}
+	apiReturn.Success(c)
+}

service/api/api_v1/system/siteCustomize.go

@@ -0,0 +1,33 @@
+package system
+
+import (
+	"sun-panel/api/api_v1/common/apiReturn"
+	"sun-panel/global"
+	"sun-panel/lib/cmn/systemSetting"
+
+	"github.com/gin-gonic/gin"
+	"github.com/gin-gonic/gin/binding"
+)
+
+type SiteCustomizeApi struct{}
+
+// 获取站点自定义配置（无需登录，登录页使用）
+func (a *SiteCustomizeApi) Get(c *gin.Context) {
+	cfg := systemSetting.SiteCustomize{}
+	global.SystemSetting.GetValueByInterface(systemSetting.SITE_CUSTOMIZE, &cfg)
+	apiReturn.SuccessData(c, cfg)
+}
+
+// 保存站点自定义配置（管理员）
+func (a *SiteCustomizeApi) Set(c *gin.Context) {
+	cfg := systemSetting.SiteCustomize{}
+	if err := c.ShouldBindBodyWith(&cfg, binding.JSON); err != nil {
+		apiReturn.ErrorParamFomat(c, err.Error())
+		return
+	}
+	if err := global.SystemSetting.Set(systemSetting.SITE_CUSTOMIZE, cfg); err != nil {
+		apiReturn.ErrorDatabase(c, err.Error())
+		return
+	}
+	apiReturn.Success(c)
+}