feat: simplify RBAC roles and remove dev role switcher

- Simplified RBAC system to two roles: super_admin and user.
- Removed tenant_admin and rp_admin roles across backend and frontend.
- Removed Dev Role Switcher feature from adminfront.
- Updated all handlers, middlewares, and navigation to reflect the new role model.
- Fixed backend build errors and updated tests.

adminfront/src/locales/en.toml

@@ -759,7 +759,6 @@ title = "Title"
 
 [ui.admin]
 brand = "Brand"
-dev_role_switcher = "🛠 DEV Role Switcher"
 title = "Admin Control"
 
 [ui.admin.api_keys]

adminfront/src/locales/ko.toml

@@ -764,7 +764,6 @@ title = "회원가입 완료"
 
 [ui.admin]
 brand = "Baron 로그인"
-dev_role_switcher = "🛠 DEV Role Switcher"
 title = "Admin Control"
 
 [ui.admin.api_keys]

adminfront/src/locales/template.toml

@@ -772,8 +772,6 @@ title = ""
 
 [ui.admin]
 brand = ""
-dev_role_switcher = ""
-dev_role_switcher_real = ""
 title = ""
 
 [ui.admin.api_keys]