feat(admin): 管理首页标题修正、角色中文显示及用户总数补全

- 修正 admin layout title 后缀为「MetaLab 管理面板」
- 当前角色从原始字符串改为中文显示（注入 RoleDisplayName）
- 补全管理首页「用户总数」统计，新增 CountUsers 方法
- 遵循 ISP 最小接口，Service 复用已有 CountSearchUsers

internal/common/helper.go

@@ -36,6 +36,11 @@ func BuildAdminPageData(c *gin.Context, extra gin.H) gin.H {
 	if role, exists := c.Get("role"); exists {
 		roleStr := role.(string)
 		data["Role"] = roleStr
+		if name, ok := model.RoleDisplayNames[roleStr]; ok {
+			data["RoleDisplayName"] = name
+		} else {
+			data["RoleDisplayName"] = roleStr
+		}
 		data["CanManageUsers"] = model.HasMinRole(roleStr, model.RoleAdmin)
 		data["CanManageSettings"] = model.HasMinRole(roleStr, model.RoleOwner)
 		data["IsOwner"] = model.HasMinRole(roleStr, model.RoleOwner)

internal/controller/admin/admin_controller.go

@@ -25,8 +25,13 @@ func NewAdminController(adminService adminUseCase) *AdminController {
 
 // Dashboard 管理首页（欢迎页）
 func (ac *AdminController) Dashboard(c *gin.Context) {
+	totalUsers, err := ac.adminService.CountUsers()
+	if err != nil {
+		totalUsers = 0
+	}
 	c.HTML(http.StatusOK, "admin/dashboard/index.html", common.BuildAdminPageData(c, gin.H{
 		"Title":      "管理首页",
+		"TotalUsers": totalUsers,
 	}))
 }
 

internal/controller/admin/interfaces.go

@@ -2,9 +2,10 @@ package admin
 
 import "metazone.cc/metalab/internal/service"
 
-// adminUseCase AdminController 对 AdminService 的最小依赖（ISP：3 个方法）
+// adminUseCase AdminController 对 AdminService 的最小依赖（ISP：4 个方法）
 type adminUseCase interface {
 	ListUsers(params service.ListUsersParams) (*service.ListUsersResult, error)
 	UpdateUserStatus(operatorUID, targetUID uint, newStatus string) error
 	ResetUserToken(operatorUID, targetUID uint) error
+	CountUsers() (int64, error)
 }

internal/service/admin_service.go

@@ -112,6 +112,11 @@ func (s *AdminService) ResetUserToken(operatorUID, targetUID uint) error {
 	})
 }
 
+// CountUsers 统计用户总数（管理首页用）
+func (s *AdminService) CountUsers() (int64, error) {
+	return s.userRepo.CountSearchUsers("", "", "")
+}
+
 // checkAndOperate 通用权限检查 + 执行操作
 func (s *AdminService) checkAndOperate(operatorUID, targetUID uint, operate func(*model.User, *model.User) error) error {
 	// 1. 不可操作自己

templates/admin/html/dashboard/index.html

@@ -7,7 +7,7 @@
         <div class="stats-grid">
             <div class="stat-card">
                 <div class="stat-icon stat-blue"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="8" r="4"/><path d="M4 20c0-4 4-7 8-7s8 3 8 7"/></svg></div>
-                <div class="stat-info"><div class="stat-label">用户总数</div><div class="stat-value">—</div></div>
+                <div class="stat-info"><div class="stat-label">用户总数</div><div class="stat-value">{{.TotalUsers}}</div></div>
             </div>
             <div class="stat-card">
                 <div class="stat-icon stat-green"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><rect x="3" y="3" width="18" height="18"/><line x1="9" y1="9" x2="15" y2="9"/><line x1="9" y1="13" x2="15" y2="13"/></svg></div>
@@ -15,7 +15,7 @@
             </div>
             <div class="stat-card">
                 <div class="stat-icon stat-orange"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polygon points="12 2 15.09 8.26 22 9.27 17 14.14 18.18 21.02 12 17.77 5.82 21.02 7 14.14 2 9.27 8.91 8.26 12 2"/></svg></div>
-                <div class="stat-info"><div class="stat-label">当前角色</div><div class="stat-value">{{.Role}}</div></div>
+                <div class="stat-info"><div class="stat-label">当前角色</div><div class="stat-value">{{.RoleDisplayName}}</div></div>
             </div>
         </div>
 

templates/admin/html/layout/base.html

@@ -4,7 +4,7 @@
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 {{if .CSRFToken}}<meta name="csrf-token" content="{{.CSRFToken}}">{{end}}
-<title>{{.Title}} - MetaLab CP</title>
+<title>{{.Title}} - MetaLab 管理面板</title>
 <link rel="stylesheet" href="/admin/static/css/common.css">
 {{if .ExtraCSS}}
 <link rel="stylesheet" href="{{.ExtraCSS}}">