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.

backend/internal/handler/admin_integrity_test.go

@@ -46,7 +46,7 @@ func TestAdminHandler_GetDataIntegrityRequiresSuperAdmin(t *testing.T) {
 	h := &AdminHandler{IntegrityChecker: checker}
 	app := fiber.New()
 	app.Use(func(c *fiber.Ctx) error {
-		c.Locals("user_profile", &domain.UserProfileResponse{ID: "tenant-admin", Role: domain.RoleTenantAdmin})
+		c.Locals("user_profile", &domain.UserProfileResponse{ID: "tenant-admin", Role: "tenant_admin"})
 		return c.Next()
 	})
 	app.Get("/api/v1/admin/integrity", h.GetDataIntegrity)
@@ -182,7 +182,7 @@ func TestAdminHandler_DeleteOrphanUserLoginIDsRejectsTenantAdmin(t *testing.T) {
 	h := &AdminHandler{IntegrityChecker: checker}
 	app := fiber.New()
 	app.Use(func(c *fiber.Ctx) error {
-		c.Locals("user_profile", &domain.UserProfileResponse{ID: "tenant-admin", Role: domain.RoleTenantAdmin})
+		c.Locals("user_profile", &domain.UserProfileResponse{ID: "tenant-admin", Role: "tenant_admin"})
 		return c.Next()
 	})
 	app.Delete("/api/v1/admin/integrity/orphan-user-login-ids", h.DeleteOrphanUserLoginIDs)